Communication Intelligence Summary, December 5, 1941
General.-Traffic volume heavy. All circuits overloaded with Tokyo broadcast going over full 24 hours.
Tokyo-Mandates circuit in duplex operation.
There were several new intercept schedules heard. OMINATO radio working SAMA and BAKO sending fleet
traffic. The Takao broadcast handling
traffic Second and Third Fleet while the Tokyo broadcast is still handling traffic for these units also.
It is noted that some traffic being
broadcast is several days old which indicates the uncertainty of delivery existing in the radio organization.
There were many messages of high precedence which appears to be caused by the jammed condition of all circuits.
A plain language message was sent by the Captain, OKAWA from Tokyo to Takao probably for further relay addressed to
FUJIHARA, Chief of the Political
Affairs Bureau saying that "in reference to the Far Eastern Crisis, what you said is considered important
at this end but proceed with what you
are doing, specific orders will be issued soon."
Combined Fleet.-Neither the Second or Third Fleet Commanders have originated any traffic today. They are still
frequently addressed but are receiving
their traffic over broadcast. They are undoubtedly in Takao area or farther south since the Takao
broadcast handles nearly all their
traffic. No traffic from the Commander Carriers or Submarine Force has been seen either.
Third Fleet.-In one WE address a "Chief of Staff" sent a
message to "Commander Fourteenth
Army abroad RYUJOMARU in Third Fleet. HITOYO.GUN.SATI
(IRO 1 REUZEU MARU). A number of MARUS have been addressing the CINC. Third Fleet.
Fourth Fleet.-The Secretary, Fourth Fleet and Staff Communication Officer the Fourth Fleet were addressed at
Jaluit today strengthening the
impression at the CinC. Fourth Fleet is in the Marshalls. The Commander of the South China Fleet has been
addressing Palao radio and the RNO
TAIHOKU and the Commander Second Fleet.
South China.-SAMA addressed much traffic to CinC. Second Fleet. BAKO continues as an active originator with many
dispatches to Second and Third Fleet.
The Commander Combined Air Force appears to be busy with the movement of Air Corps. SHIOGAMA Air and
at least two unidentified corps are
moving, probably to Indo-China.
U.S. CONGRESS JOINT COMMITTEE ON PEARL HARBOR ATTACK HEARINGS; PT. 35, THE CLAUSEN INVESTIGATION, PP. 62-81.
EXHIBIT "A" DAILY COMMUNICATION INTELLIGENCE SUMMARIES)