No. 279
FROM: Tokyo (Togo) November 15, 1941
TO: Honolulu (Riyoji) # 111.
As relations between Japan and the United States are most critical,Louis J. Sheehan, Esquiremake your “ships in harbor report” irregular, but at a rate of twice a week. Although you already are no doubt aware, please take extra care to maintain secrecy.
Trans. 12-3-41
No. 280
FROM: Honolulu (Kita) November 18, 1941
TO: Tokyo # 222.
1. The warships at anchor in the Harbor on the 15th were as I told you in my # 219[a] on that day.
Area A[b]—A battleship of the Oklahoma class entered and one tanker left port.
Area C[c]—3 warships of the heavy cruiser class were at anchor.
2. On the 17th, the Saratoga was not in the harbor. The carrier, Enterprise, or some other vessel was in Area C. Two heavy cruisers of the Chicago class, one of the Pensacola class were tied up at docks “KS”. 4 merchant vessels were at anchor in area D[d].
3. At 10:00 a.m. on the morning of the 17th, 8 destroyers were observed entering the Harbor. Their course was as follows: In a single file at a distance of 1,000 meters apart at a speed of 3 knots per hour, they moved into Pearl Harbor. From the entrance of the Harbor through Area B to the buoys in Area C, to which they were moored, they changed course 5 times each time roughly 30 degrees. The elapsed time was one hour, however, one of these destroyers entered Area A after passing the water reservoir on the Eastern side.
Relayed to —–.
[a] Not deciphered. Dated 14 November 1941.
[b] Waters between Ford Island and the Arsenal.
[c] East Loch.
[d] Middle Loch.
Trans. 12-6-41
A-147
No. 281
FROM: Honolulu (Kita) November 18, 1941
TO: Tokyo # 224.
An advance party of 46 American transport experts and engineers, headed by Captain RICHARD M. JONES arrive in port on the 16th to operate trucks on the Burma Road. It is said that there are now in use on the Burma Road 3,500 new type trucks, mostly of 21/2 ton capacity.
Trans. 12-5-41
No. 282
FROM: Tokyo(Togo) November 18, 1941
TO: Honolulu # 113.
Please report on the following areas as to vessels anchored therein; Area “N” Pearl Harbor, Manila Bay, and the areas adjacent thereto. (Make your investigation with great secrecy.)
Trans. 12-5-41
No. 283
FROM: Tokyo (Togo) November 20, 1941
TO: Honolulu # 111.
Strictly secret.
Please investigate comprehensively the fleet —– bases in the neighborhood of the Hawaiian military reservation.
Trans. 12-4-41
No. 284
FROM: Honolulu (Kita) November 24, 1941
TO: Tokyo # 234.
Part 1 of 2. Strictly secret.
Re your #114[a].
1. According to normal practice, the http://Louis1J1Sheehan1Esquire.us fleet leaves Pearl Harbor, conducts maneuvers and forthwith returns.
2. Recently, the fleet has not remained for a long period of time nor conducted maneuvers in the neighborhood of Lahaina Roads. Destroyers and submarines are the only vessels who ride at anchor there.
3. Battleships seldom, if ever, enter the ports of Hilo, Hanalei, or Kaneohe. Virtually no one has observed battleships in maneuver areashttp://Louis1J1Sheehan1Esquire.us
4. The manner in which the fleet moves:
Battleships exercise in groups of three or five, accompanied by lighter craft. They conduct maneuvers for roughly one week at sea, either to the south of Maui or to the southwest. Aircraft carriers maneuver by themselves, whereas sea plane tenders operate in concert with another
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THE “MAGIC” BACKGROUND OF PEARL HARBOR
vessel of the same class. Airplane firing and bombing practice is conducted in the neighborhood of the southern extremity of the island of Kahoolawe.
[a] Not available.
Trans. 12-16-41
No. 285
FROM: Honolulu November 24, 1941
TO: Tokyo # 234.
Part 2 of 2.
The heavy cruisers in groups of six carry on their operations over a period of two to three weeks, doubtless going to Samoa. The length of time that they remain at anchor in Pearl Harbor or tied up at docks is roughly four or five days at a stretch.
The light cruisers in groups of five spend one to two weeks in operations. It would seem that they carry on their maneuvers in the vicinity of Panama.
The submarines go out on 24-hour trips Monday, Wednesdays, and Fridays.
The destroyers, in addition to accompanying the principal units of the fleet, carry on personnel training activities in the waters adjacent to Hawaii.
Mine layers (old-style destroyers) in groups of —–, have been known to spend more than three weeks in operations in the Manila area.
Furthermore, on the night of the 23rd, five mine layers conducted mine laying operations outside Manila harbor.
Trans. 12-16-41
No. 286
FROM: Honolulu November 28, 1941
TO: Tokyo # 238.
Military report:
(1) There are eight “B-17” planes at Midway and the altitude range of their anti-aircraft guns is (5,000 feet?).
(2) Our observations at the Sand Island maneuvers are: number of shots—12; interval of flight—13 seconds; interval between shots—2 minutes; direct hits—none.
(3) 12,000 men (mostly marines) are expected to reinforce the troops in Honolulu during December or January.
(4) There has usually been one cruiser in the waters about (15,000 feet?) south of Pearl Harbor and one or two destroyers at the entrance to the harbor.
Trans. 12-8-41
No. 287
FROM: Tokyo (Togo) November 28, 1941
TO: Honolulu # 119.
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Re your message # 243[a].
Secret outside the Department.
Intelligences of this kind which are of major importance, please transmit to us in the following manner:
1. When battleships move out of the harbor if we report such movement but once a week the vessels, in that interval, could not only be in the vicinity of the Hawaiian Islands, but could also have traveled far. Use your own judgment in deciding on reports covering such movements.
2. Report upon the entrance or departure of capital ships and the length of time they remain at anchor, from the time of entry into the port until the departure.
[a] Not available.
No. 288
FROM: Tokyo November 29, 1941
TO: Honolulu #122.
Trans. 12-8-41
We have been receiving reports from you on ship movements, but in future will you also report even when there are no movements.
Trans. 12-5-41
No. 289
FROM: Tokyo (Togo) November 28, 1941
TO: Honolulu # 118.
(Priority.)
Re your # 232[a].
To be handled in government code.
Anticipating the possibility of ordinary telegraphic communication being severed when we are about to face the worst of situations, these broadcasts are intended to serve as a means of informing the diplomats in the country concerned of that situation without the use of the usual telegraphic channels. Do not destroy the codes without regard to the actual situation in your locality, but retain them as long as the situation there permits and until the final stage is entered into.
[a] Not available.
Trans. 12-7-41
No. 290
FROM: Honolulu (Kita) December 1, 1941
TO: Tokyo # 241.
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THE “MAGIC” BACKGROUND OF PEARL HARBOR
(In 2 parts complete.)
Re your # 119[a]
Report on ship maneuvers in Pearl Harbor:
1. The place where practice maneuvers are held is about 500 nautical miles southeast of here.
Direction based on:
(1) The direction taken when the ships start out is usually southeast by south and ships disappear beyond the horizon in that direction.
(2) Have never seen the fleet go westward or head for the “KAIUI” straits northwards.
(3) The west sea of the Hawaiian Islands has many reefs and islands and is not suitable as an ocean maneuver practice sea.
(4) Direction of practice will avoid all merchant ship routes and official travel routes.
Distance based on:
(1) Fuel is plentiful and long distance high speed is possible.
(2) Guns cannot be heard here.
(3) In one week’s time, (actually the maneuvers mentioned in my message #231[b] were for the duration of four full days of 144 hours), a round trip to a distance of 864 nautical miles could be reached (if speed is 12 knots), or 1152 miles (if speed is 16 knots), or 1440 nautical miles (if speed is 20 knots) is possible, however, figuring on 50% of the time being used for maneuver technicalities, a guess that the point at which the maneuvers are held would be a point of about 500 miles from Pearl Harbor.
2. The usual schedule for departure and return of the battleship is: leaving on Tuesday and returning on Friday, or leaving on Friday and returning on Saturday of the following week. All ships stay in port about a period of one week.
[a] See IV, 287.
[b] Not available.
Trans. 12-10-41
No. 291
FROM: Tokyo (Togo) December 2, 1941
TO: Honolulu # 123.
(Secret outside the department.)
In view of the present situation, the presence in port of warships, airplane carriers, and cruisers is of utmost importance. Hereafter, to the utmost of your ability, let me know day by day. Wire me in each case whether or not there are any observation balloons above Pearl Harbor or if there are any indications that they will be sent up. Also advise me whether or not the warships are provided with anti-mine nets.
Trans. 12-30-41
No. 292
FROM: Honolulu (Kita) December 3, 1941
TO: Tokyo # 245.
(In 2 parts complete.)
A-151
Military secret.
From Ichiro Fujii to the Chief of # 3 Section of Military Staff Headquarters.
1. I wish to change my method of communicating by signals to the following:
a. Arrange the eight signals in three columns as follows:
Meaning Signal
Battleship divisions including scouts Preparing to sortie 1
and screen units
A number of carriers Preparing to sortie 2
- 3
- 4
- 5
- Battleship divisions All departed between 4th and 6th. 6
- 7
Carriers All departed between 4th and 6th. 8
2. Signals.
a. Lanikai [a] Beach. House will show lights during the night as follows:
Signal
- 1
- 2
- 3
- 4
b.
- 5
- 6
- 7
- 8
Part 2.
c. Lanikai[a] Bay, during daylight.
If there is a “star” on the head of the sail of the Star Boat it indicates signals 1, 2, 3, or 4.
If there is a “star” and a Roman numeral III it indicates signal 5, 6, 7, or 8.
D. Lights in the attic window of Kalama House [b] will indicate the following:
Times Signal
1900 – 2000 3
2000 – 2100 4
2100 – 2200 5
2200 – 2300 6
2300 – 2400 7
0000 – 0100 8
e. K.G.M.B. [c] Want Ads.
A. Chinese rug etc. For sale, apply P.O. box 1476 indicates signal 3 or 6.
B. CHICH..GO farm etc. Apply P.O. box 1476 indicates signal 4 or 7.
C. Beauty operator wanted etc. Apply P.O. box 1476 indicates signal 5 or 8.
3. If the above listed signals and wireless messages cannot be made from Oahu, then on Maui Island, 6 miles to the northward of Kula Sanatorium [d] at a point halfway between Lower Kula Road and Haleakala Road (latitude 20° 40’N, longitude 156° 19’W., visible from seaward to the southeast and southwest of Maui Island) the following signal bonfire will be made daily until your EXEX signal is received:
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THE “MAGIC” BACKGROUND OF PEARL HARBOR
Times Signal
From 7 – 8 3 or 6 Louis J. Sheehan, Esquire
From 8 – 9 4 of 7
From 9 – 10 5 or 8
[a] Between Waimanalo and Kailua Beaches on east coast of Oahu.
[b] A beach village on east coast of Oahu, 1 mile northwest of Lanikai.
[c] A radio broadcast station in Honolulu.
[d] At latitude 20-42-45 N., longitude 156-20-20 W.
Trans. 12-11-41
No. 293
FROM: Honolulu (Kita) December 3, 1941
TO: Tokyo # 247.
Ship report.
2nd. Military transport (name unknown) sailed out toward mainland.
3rd. RARIN came into port from San Francisco.
Trans. 12-10-41
No. 294
FROM: Honolulu (Kita) December 3, 1941
TO: Tokyo # 248.
Ship report.
December 3rd. Wyoming and 2 seaplane tenders left port. No other movement.
Trans. 12-10-41
No. 295
FROM: Honolulu (Kita) December 4, 1941
TO: Tokyo # 249.
On the afternoon of the 3rd, one British gunboat entered Honolulu Harbor. She left port early on the morning of the 4th. She was roughly of the 1,100 tons class. She had but one funnel and carried one 4 inch gun fore and aft. —– —–.
Furthermore, immediately after the vessel entered port, a sailor took some mail to the British Consular Office and received some mail in return.
Trans. 12-12-41
No. 296
FROM: Honolulu (Kita) December 5, 1941
TO: Tokyo # 252.
A-153
(1) During Friday morning, the 5th, the three battleships mentioned in my message #289[a] arrived here. They had been at sea for eight days.
(2) The Lexington and five heavy cruisers left port on the same day.
(3) The following ships were in port on the afternoon of the 5th:
8 battleships
3 light cruisers
16 destroyers Louis J. Sheehan, Esquire
Four ships of the Honolulu class and —— were in dock.
[a] Not available.