Communications of Military Significance

December 1940

2 December
1940
From: Honolulu
(Okuda)
To: Tokyo
(Gaimudaijin) #216
" The following ships were observed at Pearl Harbor on the 1st: " See doc.
20 December 1940 From: Honolulu
(Okuda)
To: Tokyo
(Gaimudaijin) #232
" There was no ship movement in Pearl Harbor on the 19th." See doc.
24 December
1940
From:
Honolulu
(Okuda)
To:
Tokyo
(Gaimudaijin)
#234
" It is reported that ships from the battleships down returned to Pearl Harbor on Dec. 20th and will stay until Jan. 4 (5th or 6th) on Christmas leave. " See doc.
28 December
1940
From: Grunert,
Manila, P. I.
To:  TAG
" Netherlands Consul sources: Japan attacks January 15 against Netherlands Indies " See doc.
30 December
1940
From:
Commandant,
Fourteenth
Naval
District.
To:
The Chief
of
Naval Operations
"Situation Concerning the Security of the Fleet and the Present Ability of the Local Defense Forces to Meet Surprise Attacks." See doc.

January 1941

4 January 1941 From: Ft. Shafter, T. H.
To: G-2.
" This steamer and future ships will be watched report being made any further shipments this nature. " See doc.
5 January 1941 From: Fort Shafter, T. H.
To: The Adjutant
General.
" Description of three raiders operating in Pacific is as follows: " See doc.
6 January 1941 From: Honolulu
(Okuda)
To: Tokyo
(Gaimudaijin) #002
" Vessels seen in Pearl Harbor on the morning of the 5th were as follows: " See doc.
7 January 1941 From: Honolulu
(Okuda)
To: Tokyo
(Gaimudaijin) #003
" Battleships New Mexico (flag), Oklahoma, Idaho, and Mississippi, together with many cruisers and destroyers left Pearl Harbor on the morning of the 6th for training. It is reported that they will return on the 12th(?). " See doc.
7 January 1941 From: Commander-in-
Chief, United States
Fleet.
To: The Chief of Naval
Operations.
"Situation Concerning the Security of the Fleet and the Present Ability of the Local Defense Forces to Meet Surprise Attacks." See doc.
9 January 1941 From: Honolulu
(Okuda)
To: Tokyo
(Gaimudaijin)
#005
" It is reported that the light cruiser Cincinnati returned here from the Philippine Islands. This message sent to Washington and Manila. " See doc.
16 January 1941 From: Honolulu
(Okuda)
To: Tokyo
(Gaimudaijin)
#011
"1. The capital ships returned to Pearl Harbor immediately. The Pennsylvania arrived on the 14th." See doc.
16 January 1941 From:
The Commander
Patrol
Wing TWO.
To:
The Chief of Naval
Operations.
"Patrol Wing TWO-Readiness of." See doc.
21 January 1941 From: Honolulu
(Okuda)
To: Tokyo
(Gaimudaijin) #014
"The aircraft carriers Lexington and Enterprise together with four destroyers arrived in Pearl Harbor from the mainland on the 21st. "
21 January 1941 From: Commander
Scouting Force.
To: The Chief of Naval
Operations.
"Patrol Wing TWO-Readiness of." See doc.
24 January 1941 From: Secretary
of the Navy
To: Secretary
of the Army.
"The dangers envisaged in their order of importance and probability are considered to be: " See doc.
25 January 1941 From:
Commander-in-
Chief,
U.S. Fleet.
To:
The Chief
of Naval
Operations.
"Re: Chief of Naval Operations' Plan DOG." See doc.
28 January 1941 From: Honolulu
(Okuda)
To: Tokyo
(Gaimudaijin)
#018
"Four battleships of the Colorado class and fourteen destroyers arrived in Pearl Harbor from the continent on the 27th. " See doc.
31 January 1941 From:
Commander-in-
Chief,
United States
Fleet.
To: The Chief
of Naval
Operations.
"Subject: Patrol Wing TWO-Readiness of." See doc.

February 1941

5 February 1941 From Manila
To: MILID
"Japanese attack is scheduled for February, tenth repeat tenth." See doc.
6 February 1941 From: Honolulu
(Okuda)
To: Tokyo #25
"This morning I observed the following ships of war in Pearl Harbor: " See doc.
7 February 1941 From:
Secretary of War
To:
Secretary of the
Navy
"Subject: Air Defense of Pearl Harbor, Hawaii." See doc.
14 February 1941 From:
ComFOURTEENTH
"SUBJECT: Army and Navy Aircraft in Hawaiian Area." See doc.
14 February 1941 From:
ComFOURTEENTH
Subject: Measures for Communication, coordination, and liaison between the Inshore Patrol and the Harbor Defenses.
15 February 1941 From: Tokyo
(Matsuoka)
To: Washington
(Koshi)
15 February 1941
#073
" The information we particularly desire with regard to intelligence involving U. S. and Canada, are the following: " See doc.
15 February 1941 From: Tokyo
(Matsuoka).
To: Honolulu
(Riyoji).
#008
" In gathering intelligence material, your office will pay particular attention to paragraphs 1 and 2. " See doc.
15 February 1941 From: Tokyo
(Matuoka)
To: San Francisco
(Riyoji)
#020
" Will your office please pay particular attention to gathering intelligence material which will fall under the classifications outlined in paragraphs 1, 2, 3, 4, 5, 8, and 12. " See doc.
15 February 1941 From: Tokyo
(Matuoka)
To: Los Angeles
(Riyoji)
15 February, 1941
#013
" In connection with collecting intelligence material, your office will pay particular attention to contents of paragraphs 1, 2, 8, 9 and 11. " See doc.
15 February 1941 From: Tokyo
(Matuoka).
To: New York
(Riyoji).
*018
" In gathering intelligence material, your office will pay particular attention to contents of paragraphs 4, 6, 7, and 9." See doc.
15 February 1941 From: Tokyo
(Japanese Foreign
Minister)
To: Vancouver
(Japanese
Consul)
#008
" In gathering intelligence material, your office will lay particular stress on paragraph 10." See doc.
15 February 1941 From: The Chief of
Naval Operations
To: The Commander
-in-Chief,
Pacific Fleet
"Anti-torpedo baffles for protection against torpedo plane attacks,  Pearl Harbor." See doc.
21 February 1941 From: Honolulu
(Okuda)
To: Tokyo
(Gaimudaijin)
#029
"1. The capital ships and others departed from Pearl Harbor on the 13th and returned on the 19th. (It is said that they will depart again on the coming Wednesday and return on the following Wednesday). " See doc.
24 February1941 From: Honolulu
(Okuda)
To: Tokyo
#31
" The Enterprise came into port from the continent on the 21st, having transported 31 Army pursuit planes of the Curtiss-Hawk P36 classification. She immediately returned to the continent; (there is a rumor that she went on to Manila). I have observed the following ships in Pearl Harbor: " See doc.
25 February 1941 CONFERENCE
IN THE
OFFICE OF THE
CHIEF OF STAFF
AT 10:00 A. M.,
TUESDAY,
FEBRUARY 25, 1941
"In view of the Japanese situation the Navy is concerned with the security of the fleet in Hawaii, and apparently the new commander of the fleet there has made a check and reported it to Washington and the Secretary of the Navy has outlined the situation to the Secretary of War. " See doc.
25 February 1941 From: Tokyo To: MILID " the three Japanese translators and one Formosan messenger employed by this office are doing translation that can not be done adequately by American personnel. " See doc.
26 February 1941 From: Tokyo
(Japanese Foreign
Minister)
To: Vancouver
#12
" Please wire reports covering the positions and movements also of the ships of Canada's Pacific Fleet. Please transmit to Ottawa and from that office ----- to the Naval Attaché. " See doc.
27 February 1941 From: Honolulu
(Okuda)
To: Tokyo
(Gaimudaijin)
#034
" Apparently the Fleet goes to sea for a week of training and stays in Pearl Harbor one week. Every Wednesday, those at sea and those in the harbor change places. This movement was noted on last Wednesday, the 26th. " See doc.
27 February 1941 From:
Chief of Naval
Operations.
To: (Multiple)
"Subject: Patrol Wing Two-Readiness of." See doc.

March 1941

8 March 1941 From: Tokyo, Japan
To: MILID,
Washington, D. C.
" Colonel Takeo Iwakuro who sailed on S. S. Tatsuta Maru for the United States March 6th is adviser to Admiral Nomura " See doc.
10 March 1941 From: Honolulu
(Okuda)
To: Tokyo
(Gaimudaijin)
#043
" Vessels seen in Pearl Harbor on (9th) were the following: " See doc.
12 March 1941 From: Commander-in-
Chief, U. S.
Pacific Fleet.
To: The Chief of
Naval Operations
"Anti-torpedo baffles for protection against torpedo plane attacks, Pearl Harbor." See doc.
13 March 1941 From: Tokyo
via Manila
To: MILID
"...parachute training of infantry and engineers taking place for the past year. ..." See doc.
25 March 1941 UNITED STATES-
BRITISH STAFF
CONVERSATIONS
REPORT
WASHINGTON, D.C.
"Staff Conversations were held in Washington from January 29, 1941 to March 27, 1941, between the United States Staff Committee representing the Chief of Naval Operations and the Chief of Staff of the Army, and a United Kingdom Delegation representing the Chiefs of Staff. Representatives of the Chiefs of Staff of the Dominions of Canada, Australia, and New Zealand were associated with the United Kingdom Delegation throughout the course of the these conversation, but were not present at joint meetings." See doc.
28 March 1941 From:
ComFOURTEENTH
"JOINT SECURITY MEASURES, PROTECTION OF FLEET AND PEARL HARBOR BASE" See doc.
29 March 1941 From: Ft. Shafter.
To: The Adjutant General.
" Colonel Hideo Iwakuru, IJA passed through Honolulu 15th aboard Tatsuta Maru enroute Washington, D. C. " See doc.
31 March 1941 From: Comdr. Naval
Base Defense Air Force
& Commanding General
Hawaiian Air Force,
"Joint estimate covering Joint Army and Navy air action in the event of sudden hostile action against Oahu or Fleet Units in the Hawaiian area. " See doc.

April 1941

11 April 1941 14ND-JCD-42 FULL TITLE: JOINT COASTAL FRONTIER DEFENSE PLAN, HAWAIIAN COASTAL FRONTIER AND FOURTEENTH NAVAL DISTRICT SHORT TITLE: HCF 41 14ND-JCD-42 See doc.
26 April 1941 From: Manila. To: The Adjutant General. " ...German Ambassador to Japan has requested that Japanese shipping lines facilitate the evacuation of German Nationals from Philippines ..." See doc.
27 April 1941 AMERICAN-DUTCH- BRITISH CONVERSATIONS SINGAPORE, APRIL, 1941 (Short Title-"A.D.B") See doc.

May 1931

1 May 1941 From: Commandant
Fourteenth Naval District
To: Chief of Naval
Operations.
" Air Defense of Pearl Harbor" See doc.
1 May 1941 Magazine article, for
intelligence
estimations.
" JAPANESE POLICY FOR EAST ASIA" See doc.
1 May 1941 From: Office of Naval Intelligence "NAVAL COMBATANT STRENGTH" See doc.
3 May 1941 From: Tokyo.
To: Assistant
Chief of
Staff G-2
" Under the provisions of Article 20 Tripartite pact military missions known to have left Japan for Germany and Italy... " See doc.
12 May 1941 From: Honolulu
To: Tokyo
#78
" Warships observed at anchor on the 11th in Pearl Harbor were as follows: " See doc.
16 May 1941 From: Tokyo
(Matsuoka)
To: Singapore
#120
" According to a telegram from our consul in Colombo, a New York Reuters dispatch states that it is reported that the United States has already stationed a fleet in the Indian Ocean. Please pay great attention to the movements of American warships. " See doc.
26 May 1941 From: Honolulu
(Kita).
To: Tokyo.
#86
" Warships anchored in Pearl Harbor on the 24th (2) and the 25th (?) were as follows: " See doc.
28 May 1941 From: G-2
To: Multiple
" Communist Party order recently issued directs all Communist Party members of National Maritime Union to remain on board ship until further notice..." See doc.

June 1941

4 June 1941 From: United States
Attorney,
District of Hawaii.
TO: U.S. Attorney
General
"Reference is made to your letter dated May 22, 1941 in which you asked my opinion concerning the prosecution of the several Japanese Sub-Consular Agents in Hawaii and also my radiogram of May 31, 1941 relative to the same matter. " See doc.
11 June 1941 From: The Director,
War Plans Division.
To: The Director,
Naval Districts
Division
"Air Defense of Pearl Harbor" See doc.
13 June 1941 From: Chief of
Naval Operations
To: (Multiple)
"Anti-torpedo baffles for protection against torpedo plane attacks." See doc.
14 June 1941 From: Honolulu
(Kita)
To: Tokyo
#100
" On the 11th (9) two English converted cruisers entered Pearl Harbor and are at present undergoing repairs at the old (?) dry docks. " See doc.
20 June 1941 From: Commandant
Fourteenth
Naval District
To: Chief of
Naval Operations.
"Air Defense of Pearl Harbor." See doc.
23 June 1941 From: Tokyo (Jap
Foreign Minister)
To: Mexico (Koshi)
#106
" Regarding the plans for procuring maps of the Panama Canal and vicinity, please have career attaché Kihara make an official trip to Panama. " See doc.
25 June 1941 From: Vladivostok
To: Tokyo
#230
" There has been no great change in conditions here up to the 25th. " See doc.
26 June 1941 From: Manila
To: TAG
"... plans for cooperation in the event of Japanese operations against the British...." See doc.
28 June 1941 From: Manila
To: TAG
" Twenty five thousand Japanese Troops received parachute training in China and Japan " See doc.
29 June 1941 From: Tokyo. To: The Assis Chief of Staff G-2. " War Office states that cannot grant attachment regiment Japan proper ..." See doc.

July 1941

2 July 1941 From: Tokyo
To: Berlin
Circular #1390
"At the conference held in the presence of the Emperor on July 2nd The Principal Points in the Imperial Policy for Coping with the Changing Situation" were decided." See doc.
3 July 1941 From: Vladivostok
To: Tokyo
#259
" Since the beginning of the German-Soviet war the naval authorities here have tightened up on watch and are engaged in naval preparations by enforcing various exercises to meet any eventuality. " See doc.
7 July 1941 Memorandum
for the
Chief of Staff:
"Intelligence Bulletin 93: Estimate of the Eastern Siberian Situation." See doc.
7 July 1941 Memorandum for the
Adjutant General:
Subject: Secret
Radiogram
"... the Japanese Govt has determined upon its future policy ...." See doc.
11 July 1941 Memorandum
for the
Chief of Staff:
"Intelligence Bulletin 102: Strategic Estimate of the Situation." See doc.
12 July 1941 From: Tokyo.
To: MILID.
" Considerable talk and some evidence of unusual recruiting ..." See doc.
14 July 1941 From: Canton
To: Tokyo
#255.
" The recent general mobilization order expressed the irrevocable resolution of Japan to put an end to Anglo-American assistance in thwarting her natural expansion and her indomitable intention to carry this out, if possible, with the backing of the Axis but, if necessary, alone." See doc.
14 July 1941 From: Tokyo
To: Assist.
Chief of Staff
G-2
"... mobilization mentioned our number 498 taking place on considerable scale and under unusual conditions ..." See doc.
17 July 1941 Memorandum for the Chief of Staff: "Mobilization of Additional Japanese Manpower. " See doc.
17 July 1941 Memorandum for the Chief of Staff: "Japanese Movement Into French Indo-China. " See doc.
18 July 1941 Memorandum for the Chief of Staff: "Strategical Estimate of the Situation." See doc.
18 July 1941 Memorandum for the Chief of Staff: "Intelligence Bulletin 99: New Japanese Cabinet. " See doc.
19 July 1941 From: Tokyo.
To: Berlin.
#669
" The Cabinet shake up was necessary to expedite matters in connection with National affairs and has no further significance." See doc.
21 July 1941 From: Washington.
To: Tokyo.
#545
" According to information received from various sources in various areas, he continued, there are definite indications that Japan is planning to take some steps very shortly which would upset the peaceful status of certain areas." See doc.
23 July 1941 From: Manila. To: Milid. "...the Chingking forces are massing for attack on northern Indo China ..." See doc.
23 July 1941 From: Manila. To: Milid. " Recently imposed restrictions of indefinite duration on land, water, and air travel in Japan reduces available services southward to NYK Transpacific liner ..." See doc.
25 July 1941 From: Manila
(Nihro)
To: Tokyo
#433
" The United States is making a concentrated effort to strengthen Philippine defenses. " See doc.
25 July 1941 Memorandum
for the
Chief of Staff:
"Sanctions against Japan." See doc.
25 July 1941 From:
Commander-in-Chief,
U. S. Pacific Fleet.
To: Distribution
List for WPPac-46.
"U. S. PACIFIC FLEET OPERATING PLAN-RAINBOW FIVE (NAVY PLAN O-1, RAINBOW FIVE)" See doc.
27 July 1941 From: Manila. To: Milid. "Mobilization mentioned in my radio 498 and 500 still going on under conditions extreme secrecy ..." See doc.
27 July 1941 From: Tokyo To: Milid. "... occupying forces will include one specially selected pursuit wing of approximately 80 to 90 planes ..." See doc.
30 July 1941 From: Washington
(Nomura)

To: Tokyo
#609.
"During my first conversation with Roosevelt after I took office the President, referring to the Panay incident, said that at the time he cooperated with the Secretary of State and succeeded in restraining popular opinion but that in case such a thing happened a second time, it would probably be quite impossible to again calm the storm. " See doc.
30 July 1941 Memorandum for the
Chief of Staff:
"German-Japanese Relations." See doc.
30 July 1941 From: Hawaii
To: War Department
"... reliable information concerning Japanese forces in Manchuria as follows. ..." See doc.
31 July 1941 From: Tokyo (Foreign Minister)
To: Washington
#433
(Message to Berlin #708)
"From time to time you have been sending us your various opinions about what we ought to do to help Germany who desires our assistance now that she is at war with Russia. After a conference with the military, at the risk of a certain amount of repetition which may cause you some ennui, I am wiring you the Imperial Government's policy and views. " See doc.

August 1941

1 August 1941 From: Tokyo
To: Manila
#245 (or 246) (?)
" Please inform us regarding the camouflage and distinguishing marks of the American naval and military aeroplanes in Manila. " See doc.
2 August 1941 From: Tokyo
(Toyoda)
To: Panama
#63
" If possible, I would like you to telegraph me concerning the transit of the canal by English and American merchant ships." See doc.
2 August 1941 From: Manila
(Nihro)
To: Tokyo
#474
"1. Anchored warships-Dfionomi. " See doc.
2 August 1941 From: Manila
(Nihro)
To: Tokyo
#476
" Though I am making additional secret investigations, that is all for the time being. " See doc.
2 August 1941 From: Havana
(Nanjo)
To: Tokyo
#44
" Between the 16th and the 24th of July, the following American warships were anchored in the naval harbor of Guantanamo: " See doc.
4 August 1941 From: Manila
(Nihro)
To: Tokyo
#480
" Two destroyers sailed on the fourth. All the war ships at anchor have sailed. " See doc.
5 August 1941 From: Tokyo.
To: Washington.
#447
" On our side, however, there are quite a few persons who vigorously insist that the U. S. economic pressure on Japan is being daily in creased in intensity. " See doc.
12 August 1941 From: Manila
(Nihro)
To: Tokyo
#507
" At the time a non-commissioned officer of the American Navy told me confidentially that the ship mentioned in my #414 ... was the Warspite and I took this to be reliable information. " See doc.
13 August 1941 From:
Commander-in-Chief,
United States Pacific
Fleet.
To: (Multiple)
"Employment Schedules; U. S. Pacific Fleet, Second Quarter, Fiscal Year, 1942." See doc.
15 August 1941 From: Tokyo
To: Berlin
#740
" On the 15th I told the German and Italian Ambassadors in Tokyo confidentially, of my recent conversations with the Soviet Ambassador along the lines of my separate message #739*." See doc.
16 August 1941 Memorandum
for the
Chief of Staff:
"Intelligence Bulletin 112: Developments in the Far Eastern Situation." See doc.
18 August 1941 From: Panama
(Akiyama)
To: Tokyo
#120
" Ships moving through the Panama Canal " See doc.
18 August 1941 From: Panama
(Akiyama)
To: Tokyo
#121
" The Douglas B-18, the Martin B-17A bombers, totaling 100 planes, as well as a number of heavy Boeing 24's, which have been stationed at Albrook Field in the past, completely disappeared about two weeks ago. " See doc.
18 August 1941 From:
The Joint
Planning Committee,
To.
The Joint Board.
"Joint Canadian-United States Basic Defense Plan No. 2 (Short Title-ABC-22)." See doc.
20 August 1941 From: Panama
(Akiyama)
To: Tokyo
#123
" The Triomphant left Balboa for Tohita on the 17th according to report. " See doc.
20 August 1941 From: Manila
To: Tokyo
#532
" There are many tall buildings in the city, to the upper stories of which admittance is forbidden. It is thought, therefore, that antiaircraft guns have been placed in them. " See doc.
20 August 1941 From: Manila
To: Tokyo
#533
" Last March work was begun on the reparation of the airplane base south of Darurakku [a] on the way to San Miguel. " See doc.
20 August 1941 Memorandum
for the
Chief of Staff:
"Chinese Resistance." See doc.
22 August 1941 From: Davao
(Kihara)
To: Tokyo
#104
" Because too much time would be required to fill in the paddy fields as originally planned in the construction of a new air base, it is rumored that these plans have been changed. " See doc.
22 August 1941 From: Davao
(Kihara)
To: Tokyo
#107
" During the middle of July a number of American destroyers entered the harbor of Jolo. We have intelligence to the effect that they came to this port from Hawaii, but we have no evidence to substantiate it. " See doc.
23 August 1941 From: Manila
(Nihro)
To: Tokyo
#543
" Ships in port on the 23rd." See doc.
26 August 1941 From: Manila
(Nihro)
To: Tokyo
#554
" Four "S" [a] boats on the 24th and "REI" on the 25th entered the harbor." See doc.
28 August 1941 From: Batavia
(Ishizawa)
To: Tokyo
#895
" While the Java class Cruiser was still at anchor in Puriooku [b] harbor, on the morning of the 27th, one destroyer of the Bankerutu [b] class entered port. " See doc.
29 August 1941 To: G-2
Hawaiian Department,
Fort Shafter,
Territory Hawaii.
" Colonel Field of the British Army will pass through Honolulu ..." See doc.
30 August 1941 From: Manila
To: Tokyo
#559
" Warships at anchor in this harbor on the 30th: " See doc.
30 August 1941 From: Tokyo
(Toyoda)
To: Manila
#277
" Please investigate the waters in and around Manila for some trace of this warship and then make your report. " See doc.

September 1941

1 September 1941 From: Manila
(Nihro)
To: Tokyo
#562
" The Marblehead returned to port on the 31st. Two destroyers left port on the 1st." See doc.
1 September 1941 From: Tokyo
To: Manila
#279
" In regard to the points you were to note, from now on in case there is no special change, report once a week, but report each change of the following as they occur: " See doc.
2 September 1941 Memorandum for the Chief of Staff: "Conversation between the Japanese Military Attaché and the Chief, Far Eastern Section." See doc.
5 September 1941 Memorandum for the Chief of Staff: "Intelligence Bulletin 122: Brief Periodic Estimate of the World Situation. (This estimate covers the period September 3-December 1, 1941.)" See doc.
6 September 1941 From: Tokyo
(Toyoda)
To: Singapore and
Batavia
Cir. #1947
" After you have made an immediate investigation on the following matters, please make a report, sending it to us in an appropriate manner. " See doc.
8 September 1941 From: Manila
(Nihro)
To: Tokyo
#590
" On the 7th, the Houston and two destroyers entered port. " See doc.
11 September 1941 From: Manila
(Nihro)
To: Tokyo
#595
" The Houston, which we reported having entered on the 7th, has been alongside the pier loading fuel and stores until today when it left for unknown destination accompanied by two submarines and two destroyers. " See doc.
11 September 1941 Memorandum for the Chief of Staff: "Intelligence Bulletin 124: Political Developments in Japan." See doc.
11 September 1941 From: Commander Task Force THREE. To: Task Force THREE. "TASK FORCE THREE EMPLOYMENT SCHEDULE 1 OCTOBER-31 DECEMBER 1941" See doc.
12 September 1941 From: Commander Task Force TWO. To: Task Force TWO. "TASK FORCE TWO EMPLOYMENT SCHEDULE SECOND QUARTER 1942" See doc.
13 September 1941 From: Commander Task Force ONE. To: Task Force ONE. "TASK FORCE ONE EMPLOYMENT SCHEDULE SECOND QUARTER 1942" See doc.
13 September 1941 From: Manila
To: Tokyo
#601
" On the 13th an American cruiser of the Brooklyn class entered port and is taking on supplies. It is said to have come from Hawaii. " See doc.
15 September 1941 From: Manila
To: Tokyo
#604
" According to secret information received it is the St. Louis, with three other vessels (names unknown) said to be starting for Singapore. " See doc.
16 September 1941 From: Manila
(Nihro)
To: Tokyo
#605
" They left the harbor early on the 16th loaded with food supplies. On the stern three sea planes (single wing) were observed. " See doc.
17 September 1941 Memorandum
for the
Assistant
Chief of Staff,
W. P. D.:
"Combat Estimate, Japan. " See doc.
18 September 1941 From: Manila
(Nihro)
To: Tokyo
#613
"On the afternoon of the 17th, the Phoenix came in port and is now being refueled at the pier. It is reported two more ships of the same type will soon arrive." See doc.
18 September 1941 From: San Francisco
(Muto)
To: Tokyo
#218
" According to a spy report, the English warship Warspite arrived here from Bremerton on the ----- and is at present moored near the (naval arsenal at Mare Island?). " See doc.
18 September 1941 Memorandum
for the
Assistant
Chief of Staff,
W. P. D.:
"Strategic Estimate of the Situation. " See doc.
20 September 1941 From: Manila
(Nihro)
To: Tokyo
#618
" The boats anchored here, the 26th, are: " See doc.
20 September 1941 From: Seattle
(Sato)
To: Tokyo
#123
" The following warships are now at Bremerton " See doc.
22 September 1941 From: Honolulu
(Kita)
To: Washington
#173.
" Naval Captain G. T. GARGENLIEU, High Commissioner for Pacific territories under the jurisdiction of the DeGaulle Regime, and Commander G. GABANTER, Commander of Defense, took passage on this destroyer to take up their new posts. " See doc.
22 September 1941 From: Panama
(Akiyama)
To: Tokyo
#173
" Ships passing through the Canal between the 17th and 21st are as follows: " See doc.
22 September 1941 From: Manila
(Nihro)
To: Tokyo
#623
" The Phoenix left port the morning of the 22nd. " See doc.
23 September 1941 From: Buenos Aires
To: Panama
#416.
" When Minister Yamagata* was in Panama he was asked by the Italian Minister there to deliver some maps and charts of the Panama Canal Zone for him, which he did. Since then, we had Usui go to Chile to take charge of those maps and upon their arrival here they were delivered to the Italian Ambassador. " See doc.
23 September 1941 Memorandum for the Chief of Staff: "Intelligence Bulletin 131: Crisis in Japan." See doc.
24 September 1941 From: Tokyo
(Toyoda)
To: Honolulu
#83
" Henceforth, we would like to have you make reports concerning vessels along the following lines insofar as possible: " See doc.
26 September 1941 From: Davao
(Kihara)
To: Tokyo
#135
" Since last August American destroyer tenders, destroyers and submarines enter that port from the South Seas every Saturday. " See doc.
29 September 1941 From: Honolulu
(Kita)
To: Washington
#178
" The following codes will be used hereafter to designate the location of vessels: " See doc.
30 September 1941 From: Panama
(Akiyama)
To: Washington
#51
(Message to Tokyo #188.)
" On the (29th?) two (French ?) warships left port bound for the Pacific. One vessel of the Omaha class left port on the night of - - - - - for an unknown destination. " See doc.

October 1941

2 October 1941 From: Panama
(Akiyama)
To: Tokyo
#190
" Since the recent shift in military aviation efforts to the Pacific Area the "Panama Air Depot" located at France Field was transferred to Curunda Heights (immediately adjacent to Albrook Field). " See doc.
2 October 1941 From: Panama (Akiyama)
To: Tokyo
#191
" Between the 30th and the 2nd, three American freighters and one English hospital ship transited the canal to the Pacific, and nine American freighters and one American liner transited the canal to the Atlantic. " See doc.
2 October 1941 From: Tokyo
To: Davao
#62
Re your #105.
"Please wire me the location and movements of fishermen and - - - - - since your last report. " See doc.
2 October 1941 From: San Francisco
(Muto)
To: Washington
Circular #222.
Message to
Tokyo as #230.
" One Oklahoma class battleship has arrived in port and is moored in front of the Bethlehem ship-building yard. " See doc.
2 October 1941 Memorandum
for the
Chief of Staff:
"Intelligence Bulletin 135: Japanese-American Relations." See doc.
4 October 1941 From: Panama
(Akiyama)
To: Tokyo
#194
Re my
message #193
" From the 3rd until the morning of the 4th three American freighters and one French steamer moved out into the Pacific. " See doc.
4 October 1941 From: Tokyo
(Toyoda)
To: Manila
#318
"I want you to make a reconnaissance of the new defense works along the east, west and southern coasts of the Island of Luzon, reporting on their progress, strength, etc. Also please investigate anything else which may seems of interest." See doc.
6 October 1941 From: Panama (Akiyama)
To: Tokyo
October 6, 1941 #194
" The result of my investigations, as I reported in my secret letter #142 [a] are as follows: " See doc.
14 October 1941 From:
Commander-in-Chief,
United States
Pacific Fleet.
To: PACIFIC FLEET.
Subject: Security of Fleet at Base and in Operating Areas. "PACIFIC FLEET CONFIDENTIAL LETTER NO. 2CL-41 (REVISED)" See doc.
14 October 1941 From: Manila
(Nihro)
To: Tokyo #685
" On the afternoon of the 13th the Houston, the Marblehead, the Hoh, [a] five destroyers, and two mine layers left port. Their destination is unknown. " See doc.
16 October 1941 From: Tokyo
(Toyoda)
To: Washington
#671
" However, early this month, following the German attacks on American merchant ships and the consequent (revival?) of the movement for the revision of the Neutrality Act, the German authorities demanded that the Japanese Government submit to the American Government a message to the effect that the Japanese Government observes that if the ROOSEVELT Administration continues to attack the Axis Powers increasingly, a belligerent situation would inevitably arise between Germany and Italy on the one hand and the United States on the other, and this would provide the reasons for the convocation of the duties envisioned in the Three Power agreement and might lead Japan to join immediately the war in opposition to the United States. " See doc.
16 October 1941 From Tokyo (Toyoda) To: Seattle Cir. #2187 " Henceforth, I would like to have you refer in your reports to the movement of warships as follows: " See doc.
16 October 1941 From: CNO.
Action: CINCLANT
CINCPAC CINCAF
"The resignation of the Japanese Cabinet has created a grave situation " See doc.
16 October 1941 Memorandum
for the
Chief of Staff
"Fall of the Japanese Cabinet" See doc.
17 October 1941 From: Manila
To: Tokyo. #691
" In addition to the above ships in port at present on the 18th are as follows: " See doc.
17 October 1941 Memorandum
for the
Chief of Staff
"Japan's New Premier" See doc.
17 October 1941 Issuing Office:
G‑2, H. H. D.
Army
Contact Office
Honolulu, T. H.
"SPECIAL INTELLIGENCE REPORT Subjects:  New Japanese Premier Hideki or Eiki Tojo" See doc.
17 October 1941 Issuing Office:
G‑2, H. H. D.
Army
Contact Office
Honolulu, T. H.
"G‑2 ESTIMATE OF INTERNATIONAL (JAPANESE) SITUATION" See doc.
18 October 1941 From: Panama
(Akiyama)
To: Tokyo
#220
"In order to find out the plans of the Canal command, I inspected the military establishment at the Pacific end on the 10th. (Naturally they do not allow us to inspect the forts.)" See doc.
21 October 1941 From: Davao
(Kihara)
To: Tokyo
#156 Regarding my #124*.
"As an air base for central Mindanao district, 300 men are being managed by Americans, and the ground is now being leveled. " See doc.
21 October 1941 Memorandum
for the
Chief of Staff:
"Intelligence Bulletin 144: Subject: The Kwantung versus the Siberian Army " See doc.
22 October 1941 From: Tokyo
To: Singapore
#316
"From the Vice-Chief of General Staff. Through Chancellor TAHIRA please report the following two things concerning the air force now stationed in the Federated Malay States: " See doc.
22 October 1941 From: Tokyo
To: Batavia #659
" Will you please inspect and report on the air force in the Dutch Indies in regard to: " See doc.
22 October 1941 From: Seattle
(Sato)
To: Tokyo #150
" The following warships entered Bremerton Naval Yard on the 21st: The Warspite "repairs are to be made to her bridge), the Maryland and a vessel which seems to be a cruiser. " See doc.
24 October 1941 From: Manila
To: Tokyo
#707
" 1. Two destroyers, the Ton [a] and the Maddo, [a] two submarines, and one mine layer touched port on the afternoon of the 23rd. " See doc.
25 October 1941 From: Manila
(Nihro)
To: Tokyo.
#711
" 1. The REI* and one destroyer left during the morning of the 25th. Destination is not known. " See doc.
25 October 1941 From: Batavia
To: Tokyo
#1150
" As complete and reliable information regarding the N. E. I. air forces is not yet in hand, I will merely report the main items: " See doc.
25 October 1941 Issuing Office:
G‑2, H. H. D.
Army
Contact Office
Honolulu, T. H.
"G‑2 ESTIMATE OF INTERNATIONAL (JAPANESE) SITUATION" See doc.
27 October 1941 From: Manila
(Nihro)
To: Tokyo
#713
" 1. The PISU entered Cavite on the 26th and the REI entered on the morning of the 27th. " See doc.
27 October 1941 From: Manila, Philippine Islands. To: Milid, Washington. "... two aircraft carriers have been operating among mandated islands, ..." See doc.
28 October 1941 From: Panama
(Akiyama)
To: Tokyo
#232
"1. On the 27th, a warship of the Omaha class left this port for the Pacific. " See doc.
28 October 1941 From: Seattle
(Sato)
To: Tokyo
#150
" In commemoration of Navy Day, the 27th, fifteen Coast Guard vessels sailed through the harbor here in single file. Their names were as follows:" See doc.
29 October 1941 From: Manila To: Tokyo #719? " The TON* and the MADDO** sailed on the afternoon of the 28th and the Chester on the morning of the 29th. Destination unknown." See doc.
29 October 1941 From: Manila, P. I. To: MILID " Three Japanese aircraft carriers ..." See doc.
29 October 1941 From: G-2 To: Multiple "... War with United States would best begin in December or in February ..." See doc.
31 October 1941 From:
Commander-in-Chief,
United States
Pacific Fleet.
To: PACIFIC FLEET.
"PACIFIC FLEET CONFIDENTIAL LETTER 14CL-41" See doc.

November 1941

1 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
1 November 1941 Office of Naval
Intelligence
"FORTNIGHTLY SUMMARY OF CURRENT NATIONAL SITUATIONS" See doc.
1 November 1941 Memorandum
for the
Chief of Staff:
"Intelligence Bulletin 148: Possible Japanese Drive into Yunnan" See doc.
2 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
2 November 1941 Memorandum
for the
Assistant
Chief of Staff,
W. P. D.:
"G-2 Estimate, Far Eastern Situation." See doc.
3 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
4 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
5 November 1941 Order to:
Yamamoto, C in C,
Combined Fleet
Navy Order No. 1: "...Japan has decided to complete various operational preparations within the first ten days of December...." See doc.
5 November 1941 Order to:
Yamamoto, C in C,
Combined Fleet
Navy Directive No. 1: "... The Combined Fleet will advance necessary forces at a suitable time to their preparatory points to stand by for the start of operations in the event of unavoidable hostilities against America,..." See doc.
5 November 1941 Order to:
Yamamoto, C in C,
Combined Fleet
Imperial Navy's Course of Action in Operations Against United States, Great Britain, and the Netherlands (Attached to Navy Directives No. 1 and No. 9)
5 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
6 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
7 November 1941 Order to:
Combined Fleet
Combined Fleet Operations Order No. 2: "First Preparations for War. Y Day 8 December. " See doc.
7 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
8 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
9 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
10 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
10 November 1941 From:
Commander-in-Chief,
United States
Pacific Fleet.
To: (Multiple)
"Employment Schedules, U. S. Pacific Fleet, Third Quarter, Fiscal Year, 1942." See doc.
11 November 1941 From: Panama
(Akiyama)
To: Tokyo
#273
" Ships passed through Panama on 11th and 12th." See doc.
12 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
12 November 1941 From: Panama
(Akiyama)
To: Tokyo
#282
" On the night of the 11th, a British light cruiser went through the Canal in the direction of the Atlantic." See doc.
12 November 1941 From: Manila
(Nihro)
To: Tokyo
#753
" On the morning of the 12th, an American cruiser of the Chester class entered port." See doc.
12 November 1941 From: Manila
(Nihro)
To: Tokyo
#754
" According: to a report handed on to me by a Japanese who has lived in the Province of Ilocos Norte for some fourteen or fifteen years? the following has been ascertained." See doc.
12 November 1941 From: Manila
(Nihro)
To: Tokyo
#755
" A report given me by a Japanese who resides in Camarines Norte [a] is follows:" See doc.
13 November 1941 From: Panama
(Akiyama)
To: Tokyo
#285
" Panama shipping report:" See doc.
13 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
13 November 1941 Memorandum
for the
Chief of Staff:
"Intelligence Bulletin 148-1: Possible Japanese Drive into Yunnan" See doc.
14 November 1941 From: Tokyo
To: Washington
" Points 1, 2, 3, and 4 are given in my #727 [a]." See doc.
14 November 1941 From: Manila, P. I.
To: TAG
"... Japanese evacuating troops and air forces middle Yantze ..." See doc.
14 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
15 November 1941 From: Tokyo
To: Manila
#368 Re your #746*.
" Please ascertain by what route the large bombers went to the Philippines, and also please make investigations again as to their number. " See doc.
15 November 1941 From: Manila
(Nihro)
To: Tokyo
#767
" 1. It has been ascertained that the ship of my #757*, paragraph 2, was a British transport, the AWATEA which entered port at the same time under convoy, (12000 or 13000 tons, 700 or 800 soldiers on board)." See doc.
15 November 1941 From: Manila
To: Tokyo
#767
" The following is from a report of a Japanese resident in Cebu." See doc.
15 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
15 November 1941 Office of Naval
Intelligence
"FORTNIGHTLY SUMMARY OF CURRENT NATIONAL SITUATIONS" See doc.
16 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
17 November 1941 From: Manila
(Nihro)
To: Tokyo
#769
" On the morning of the 17th the ... left port." See doc.
17 November 1941 From: Honkong
(Yano)
To: Ottawa
Unnumbered
Hongkong to Tokyo
#542
" There have been rumors to the effect that the Canada army troops would soon be sent to the Orient." See doc.
17 November 1941 From: Tokyo
(Grew)
To: Washington
(Sec. State)
"... emphasizing the need to guard against sudden Japanese naval or military actions in such areas as are not now involved in the Chinese theater of operations...." See doc.
17 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
18 November 1941 From: Tokyo (Togo)
To: Honolulu
#113
" Please report on the following areas as to vessels anchored therein:" See doc.
18 November 1941 From: Panama
(Akiyama)
To: Tokyo
#300
" On the 18th, one British ship and one Netherlands vessel of approximately 17,000 tons went through the Canal in the direction of the Pacific." See doc.
18 November 1941 From: Manila
To: Tokyo
#757
" The CA heavy cruiser of my #753* was the Portland. " See doc.
18 November 1941 From: Tokyo (Togo)
To: Singapore
#353
" ----- ----- that a squadron consisting of eight ships of the 15,000 ton class and ten other boats set out from port on November 4th with about 10,000 British troops, including many aviators heading for the Malay States." See doc.
18 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
19 November 1941 From: Honolulu
(Kita)
To: Tokyo
#222
"The warships at anchor in the Harbor on the 15th were as I told you in my #219 [a] on that day. " See doc.
19 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
20 November 1941 From: Tokyo
(Togo)
To: Honolulu
#111
" Please investigate comprehensively the fleet - - - - - bases in the neighborhood of the Hawaiian military reservation. " See doc.
20 November 1941 From: Panama
(Akiyama)
To: Tokyo
#310
" 1. On the 19th and 20th, four American cargo ships, one British cargo ship and one tanker, and one French - - - - -, passed across to the Pacific." See doc.
20 November 1941 From: Manila
(Nihro)
To: Tokyo
#693
" The Houston, the Marblehead, eight destroyers, ten submarines (of the 170 and 190 class) and one mine layer left port on the morning of the 20th." See doc.
20 November 1941 From: Tokyo (Togo)
To: Manila
#372
" Please advise immediately the results of your investigations as to the type of drift ----- presumed to be in the waters adjacent to Subic Bay [a]." See doc.
20 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
21 November 1941 Order to:
Yamamoto, C in C,
Combined Fleet
Navy Order No. 5: "...The Commander-in-Chief of the Combined Fleet will dispatch at an appropriate time the necessary forces for the execution of operations to positions of readiness. ..." See doc.
21 November 1941 Order to:
Yamamoto, C in C,
Combined Fleet
Navy Directive No. 5: "...The Commander-in-Chief of the Combined Fleet will immediately assemble and call back the operational units if the Japanese-American negotiation is successful. ..." See doc.
21 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
21 November 1941 From: OPNAV
Action: CINC AF
CINC PAC
"...a Japanese expeditionary force has arrived in the vicinity of Palau..." See doc.
22 November 1941 From: Manila
(Nihro)
To: Tokyo
#785
" A camouflaged British cruiser (guessed to be 4 or 5 thousand tons; having 8 guns; name unknown) entered port on the morning of the 21st and anchored at Pier #7, sailing at 5 in the afternoon, destination unknown." See doc.
22 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
22 November 1941 From: CINCPAC
Action: OPNAV
"...Indications are 4th Fleet may move Palao...." See doc.
22 November 1941 From:
Spenavo London
Action: OPNAV
"...Dutch Government has received reports to the effect that Japan is concentrating an expeditionary force in Palau...." See doc.
23 November 1941 To:
Carrier Striking
Task Force
Carrier Striking Task Force Operations Order No. 1: "...The Carrier Striking Task Force will proceed to the Hawaiian Area with utmost secrecy and, at the outbreak of the war, will launch a resolute surprise attack on and deal a fatal blow to the enemy fleet in the Hawaiian Area. ..." See doc.
23 November 1941 To:
Carrier Striking
Task Force
Carrier Striking Task Force Operations Order No. 3: "...The Hawaiian operations air attack plan has been decided as follows: ..."
23 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
23 November 1941 From: CNO
Action: SPENAVO
"...OPNAV questions accuracy of information concerning an expeditionary force near the Pelews ..." See doc.
23 November 1941 From: CINCAF
Action: OPNAV
Info: CINCPAC
"...No information here supporting Dutch report..." See doc.
24 November 1941 From: Honolulu (Kita)
To: Tokyo
#234
Re your #114
" According to normal practice, the fleet leaves Pearl Harbor, conducts maneuvers and forthwith returns." See doc.
24 November 1941 From: Manila
(Nihro)
To: Tokyo
#789
" Putting together various reports, it appears that a large amount of military stores was removed from the "port area" during the "blackout" on the night of the 21st." See doc.
24 November 1941 From:
CHIEF OF NAVAL
OPERATIONS.
Action: CINCAF
CINCPAC COM11
COM12 COM13
COM15.
"Chances of favorable outcome of negotiations with Japan very doubtful..." See doc.
24 November 1941 From: OPNAV
Action: SPENAVO
London
"...None of these special reports show any info supporting the Dutch report...." See doc.
24 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
25 November 1941 From: Manila
(Nihro)
To: Tokyo
#790
" On the 23rd a camouflaged submarine tender, the Holland* (5 or 6 thousand tons, apparently a camouflaged Dutch vessel), entered port." See doc.
25 November 1941 FROM: CINCAF
ACTION: OPNAV
INFO: CINCPAC
"...Portuguese Timor was named as objective of the alleged expeditionary force...." See doc.
25 November 1941 Memorandum
for the
Chief of Staff
"Far Eastern Situation." See doc.
25 November 1941 Order to:
Carrier Striking
Task Force
Combined Fleet, Operations Order No. 5 (General Outline): "The Carrier Striking Task Force will immediately complete taking on supplies and depart with utmost secrecy from Hitokappu Bay on 26 November and advance to the standby point (42 N, 170 W) by the evening of 3 December." See doc.
25 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
26 November 1941 From: CNO
To: CINCPAC.
"...Army has agreed to station twenty five Army pursuit planes at Midway and a similar number at Wake..." See doc.
26 November 1941 From: CNO
To: CINCPAC.
"...Army has agreed to station twenty five Army pursuit planes at Midway and a similar number at Wake..." See doc.
26 November 1941 From: CNO
To: CINCPAC.
"Army has offered to make available some units of Infantry for reenforcing defense battalions now on station..." See doc.
26 November 1941 Memorandum
for the
Chief of Staff:
"Japanese Naval Task Force." See doc.
26 November 1941 From: Cmdr. Layton
To: Adm. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
27 November 1941 From: Manila
(Nihro)
To: Tokyo
#797
" The Portland, BUKKU*, 2 destroyers, 10 submarines, left port on the 26th (?). Destination unknown. " See doc.
27 November 1941 From: G-2
To: Multiple
"... it appears that the conference with the Japanese has ended in an apparent deadlock ..." See doc.
27 November 1941 From:
CHIEF OF NAVAL
OPERATIONS.
Action: CINCAF,
CINCPAC.
Info: CINCLANT,
SPENAVO.
"This despatch is to be considered a war warning..." See doc.
27 November 1941 MEMORANDUM
FOR THE
PRESIDENT
From: Chiefs of Staff.
"Far Eastern Situation." "...The most essential thing now, from the United States viewpoint, is to gain time...."See doc.
27 November 1941 Memorandum
for the
Chief of Staff:
" Recent developments in the Far East." See doc.
27 November 1941 From:
Commander-in-Chief,
United States
Pacific Fleet.
To: PACIFIC FLEET.
"Pacific Fleet Intelligence Bulletin No. 45-41." See doc.
27 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
28 November 1941 From: Tokyo
(Togo)
To: Honolulu
#119
Re your #243.
" Intelligences of this kind which are of major importance, please transmit to us in the following manner: " See doc.
28 November 1941 From: Honolulu
To: Tokyo
#238
" Military report: " See doc.
28 November 1941 From: Manila
(Nihro)
To: Tokyo
#799
" Recently they have utilized a group of nine planes (one flight of six and another of three planes) in high-level scouting patrols over the city of Manila from four o'clock in the morning." See doc.
28 November 1941 From: CHIEF OF NAVAL OPERATIONS. Action: COM PNNCP COM PSNCF. Info: CINCPAC COM PNCF. "...negotiations with Japan appear to be terminated to all practical purposes with only the barest possibilities that the Japanese Government might come back and offer to continue ..." See doc.
28 November 1941 From: Com 14 Action: Opnav "...Japanese will attack Krakow Isthmus from sea on 1 December without ultimatum or declaration..." See doc.
28 November 1941 From: CINCPAC. To: OPNAV. "...12 Marine fighters leave Nov. 28 in carrier for Wake. Expect send other Marine planes to Midway later..." See doc.
28 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
29 November 1941 From: Tokyo
To: Honolulu
#122
" We have been receiving reports from you on ship movements, but in future will you also report even when there are no movements. " See doc.
29 November 1941 From: Manila
(Nibro)
To: Tokyo
#805
" Ships in port on the 29th." See doc.
29 November 1941 From: Tokyo
To: San Francisco
Circular #2431
" Make full report beginning December 1st on the following: " See doc.
29 November 1941 From: Fort Shafter To: TAG " With reference to protection of vital installations outside of Military reservations ..." See doc.
29 November 1941 Originator: OPNAV.
Action: CINCPAC.
"...War Dept will endeavor to expedite plans for increase of AA defenses but it is doubtful if much improvement is possible soon..." See doc.
29 November 1941 Memorandum for the Chief of Staff "Intelligence Bulletin 159: BRIEF PERIODIC ESTIMATE OF THE SITUATION, DECEMBER 1, 1941‑MARCH 31, 1942" See doc.
29 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
30 November 1941 From: OPNAV.
To: CINCAF,
CINCPAC (Info).
"...Japan about to attack points on Kra Isthmus by overseas expedition..." See doc.
30 November 1941 From: Opnav
Action: Cincaf
Info: Cincpac
"...Only 1 small cruiser and 1 auxiliary were disclosed by today's reconnaissance in position approximately 14-00 north 110-00 east...." See doc.
30 November 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.

December 1941

1 December 1941 From: Honolulu (Kita)
To: Tokyo
#241
Re your #119*
" Report on ship maneuvers in Pearl Harbor: " See doc.
1 December 1941 From: Washington
To: Panama
#040
"Report passage through the Canal of the U. S. S. MISSISSIPPI, NORTH CAROLINA, WASHINGTON, WASP. " See doc.
1 December 1941 From: Manila
(Nihro)
To: Tokyo
#812
" Ships in port on the 1st. " See doc.
1 December 1941 From: Cincaf
Action: Opnav
Info: Cinc China
"Results of today's reconnaissance negative even including the close vicinity Camranh Bay: Reference Opnav's dispatch 301709." See doc.
1 December 1941 Order to:
Yamamoto, C in C,
Combined Fleet
Navy Order No. 9: "...Japan has decided to open hostilities against the United States, Great Britain, and the Netherlands early in December. ..." See doc.
1 December 1941 Order to:
Yamamoto,
C in C,
Combined Fleet
Navy Directive No. 9: "...Operations of the Combined Fleet against American, England and Holland will be conducted in accordance with the Separate Volume, Imperial Navy's Course of Action in Operations against United States, Great Britain and the Netherlands. ..." See doc.
1 December 1941 Office of Naval
Intelligence
"FORTNIGHTLY SUMMARY OF CURRENT NATIONAL SITUATIONS" See doc.
1 December 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
2 December 1941 From: Tokyo (Togo) To: Honolulu #123 " In view of the present situation, the presence in port of warships, airplane carriers, and cruisers is of utmost importance." See doc.
2 December 1941 From: Cincaf
Action: Opnav Info: Cinc China
"...Bearing 070 from Saigon distant 180 miles 3 type I-61 submarines in cruising formation headed south 15 knots. 21 transports anchored Camranh Bay with six planes patrolling overhead...." See doc.
2 December 1941 From: Cincaf
Action: Opnav
Info: Cinc China
"Patrol plane sighted 9 submarines speed 10 course south at 0230 Greenwich Lat 13-10 N, Long 110-00 East." See doc.
2 December 1941 Order to:
Yamamoto, C in C,
Combined Fleet
Navy Order No. 12: "...As of 8 December the Commander-in-Chief of the Combined Fleet will start military operations in accordance with Imperial General Headquarters Navy Order No. 9. ..." See doc.
2 December 1941 Verbal Directive to:
Yamamoto,
Commander-in-Chief,
Combined Fleet
(in Tokyo at the time)
Verbal Directive of the Chief of the Naval General Staff: "Should it appear certain that Japanese-American negotiations will reach an amicable settlement prior to the commencement of hostilities, it is understood that all elements of the Combined Fleet are to be assembled and returned to their bases in accordance with separate orders. " See doc.
2 December 1941 To all IJN units. Combined Fleet Telegraphic Operations Order No. 021730 "8th December designated as X Day." See doc.
2 December 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
2 December 1941 FROM: CINCAF
ACTION: C X M
       CINC CHINA
INFO: OPNAV
"No results of significance today's reconnaissance other than as reported before. " See doc.
3 December 1941 From: Honolulu
(Kita)
To: Tokyo
#247
" Ship report: " See doc.
3 December 1941 From: Honolulu
(Kita)
To: Tokyo
#245
" I wish to change my method of communicating by signals to the following:" See doc.
3 December 1941 From: Honolulu
(Kita)
To: Tokyo
#248
" Ship report. " See doc.
3 December 1941 From: OPNAV.
Action: CINCAF,
CINCPAC, COM 14,
COM 16.
"...Washington and London to destroy most of their codes and ciphers at once and to burn all other important confidential and secret documents..." See doc.
3 December 1941 FROM: CINCAF
ACTION: OPNAV
"No results from reconnaissance today." See doc.
3 December 1941 FROM: SPENAVO
LONDON
ACTION: OPNAV
"...it was undesirable that any declaration should be made unless there was the plainest evidence that Japanese were preparing an expedition against Netherlands territory...." See doc.
3 December 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
4 December 1941 From: Honolulu
(Kita)
To: Tokio
#249
" On the afternoon of the 3rd one British gunboat entered Honolulu harbor." See doc.
4 December 1941 FROM: CINCAF
ACTION: OPNAV
"Negative results from Dec. 4th reconnaissance. " See doc.
4 December 1941 From: SPENAVO
LONDON
Action: OPNAV
"That it therefore seemed better to make no declaration at all until there was evidence more definite than was at present available of concentrations of Japanese forces constituting a threat to Netherlands territory. ..." See doc.
4 December 1941 From: Manila, P. I. To: Adjutant General "... all practical steps within the limits of the facilities of this command are being taken to protect all air and ground installations...." See doc.
4 December 1941 From: Batavia
(Foote)
To: Washington
(Sec. State)
"... following will be broadcast at end weather reports: ..." See doc.
4 December 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
5 December 1941 From: Honolulu (Kita)
To: Tokyo
5 December 1941
(PA-K2)
#252
" During Friday morning. the 5th, the three battleships mentioned in my message #239* arrived here. They had been at sea for eight days. " See doc.
5 December 1941 From: Tokyo
To: Singapore
#377
" (Abstract) Wants immediate report on ships in port and movements of capital ships. " See doc.
5 December 1941 Memorandum
for the
Chief of Staff
"Intelligence Bulletin 159-A: Supplementary Brief Periodic Estimate of the Situation December 1, 1941-March 31, 1942." See doc.
5 December 1941 From: CNO
Action:
Spenavo London
"...the possibility of an attack by the Japanese from that region against the Philippines or Nei cannot be ruled out..." See doc.
5 December 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
6 December 1941 From: Tokyo
To: Bangkok
#852
" The (----) [a] day (X Day) decided by the ---- [b] liaison conference on the 6th (?) [c] is the 8th and the day on which the notice is to be given is the 7th (?) (Sunday). As soon as you have received this message, please reply to that effect." See doc.
6 December 1941 From: Honolulu
To: Tokyo
#253
Re your #123.
" On the American Continent in October the Army began training barrage balloon troops at Camp Davis, North Carolina." See doc.
6 December 1941 From: Honolulu
To: Tokyo
#254
" On the evening of the 5th, among the battleships which entered port were and one submarine tender. The following ships were observed at anchor on the 6th: " See doc.
6 December 1941 From: Seattle
To: Tokyo
#184
" The ships at anchor in Bremerton on the 5th were the Warspite (came out of the dock and at present is tied up at a pier) and the Colorado. " See doc.
6 December 1941 G-2
Memorandum
"... reported to have burned its Code Book and Ciphers last night." See doc.
6 December 1941 Memorandum
for the
Chief of Staff
"Estimate of Japanese Air and Ground Forces in Indo-China, Hainan and Formosa." See doc.
6 December 1941 Memorandum
for the
Chief of Staff
"Estimate of Japanese Strength in Indo-China" See doc.
6 December 1941 From: Cmdr. Layton
To: Ad. Kimmel
COMMUNICATION INTELLIGENCE SUMMARY See doc.
7 December 1941 From: Tokyo
To: Washington
#910
" After deciphering part 14 of my #902 [a] and also #907 [b], #908 [c] and #909 [d], please destroy at once the remaining cipher machine and all machine codes. Dispose in like manner also secret documents. " See doc.
7 December 1941 From: Melbourne
via Honolulu,
To: War Department
& C. G. Hawaiian
Department
"... Dutch ordered execution plan A-2 and suggested RAAF reciprocal movement ..." See doc.
7 December 1941 Office of Naval
Intelligence.
"NAVAL COMBATANT STRENGTH" See doc.
18 December 1941 G-2
Memorandum
" Subject: Reports of Rumors Concerning Japanese Attack on Hawaii. " See doc.
31 December 1941 G-2 (Hawaii)
Memorandum
" Subject: Report on Internal Subversive Activities for the Month of December 1941 " See doc.