[160] Communication Intelligence Summary, 20-21
November 1941
Mandates and Fourth Fleet.-The R. N. O. Palao and Palao radio stations have remained active with the Fourth Fleet and
5 Yokosuka for days. This is taken to
indicate a coming concentration of forces in Palao which would include the Fourth Fleet and some of
the Second Fleet who has also been
active with the R. N. O. Since the activity of the Second Fleet Commander has been so great it may be that he
will assign some non- Second Fleet units to that area but just which ones is
not yet known. From information from
radio sources there is no indication of any concentration now at Palao beyond the Third Base Force which is
based there. There has been no traffic
for other fleet units routed there and the
Maru traffic to Palao is far less than the normal flow to that area. With the arrival of Siti 4 (yesterday
reported as either a carrier unit or
submarine unit and now identified as a submarine squadron of the Submarine Fleet) the concentration of naval
forces in the Marshalls is far greater
than that existing at Palao.
(FROM: U.S. CONGRESS JOINT COMMITTEE ON PEARL
HARBOR ATTACK HEARINGS; PT. 35, THE
CLAUSEN INVESTIGATION, PP. 62-81. EXHIBIT "A" DAILY COMMUNICATION
INTELLIGENCE SUMMARIES)