REF ID:A488471 

Information from DocumentarY ~Tidence 

on Messages No, 901, 902. 907, 9!Q 

Note: Information based on docnunents in Navy files 

indicated by "(N) 11 ; information based on documents 

in Army files indicated by tt(A) 11 , 

No. 901 (pilot message; Exhibit 1, p. 

Filed by the Japanese 8:56 p,m. 

6 Dec Tokyo time (A & N) 

Intercepted 1~ Japanese code by Navy 

Stat,ion S (Bainbridge Island, 

Washington) 1215-1220 GMT 6 Dec (N) 

'reletyped in Japanese code to Navy (1-T & A) 

Washin~ton Time 

6 : 56 a. m, 6 Dec· 

7:1'5-7:20 a.,m, 6 Dec 

Teletype sheet containing Japanese code 12:05 p.m. 6 Dec 

received by Army SIS from Navy (A) 

Decoded, translated and typed at Army SIS (A) 6 DecNo. 902 (14 part memo; Exhibit 1, pp, 239-45) 

Part 1 

Filed by the Japanese 10:00 p;m, 

6 Dec Tokyo time (N) · 

Intercepted in Japanese code by 

Navy Station S (Bainbridge 

Island, Washington) 1303-13l0 GMT 

6 Dec (l~) 

Teletyped in Japanese coc5..e to Navy (M) 

Received in Japanese code in Navy 

Dept. 1649 GMT 6 Dec (N) 

Decoded* and typed up at Navy (N) 

8:00 a.m. 6 Dec 

8:03-8:10 a,m. 

6 Dec 

11:49 a,m. 6 Dec 

6 Dec 

*All :parts of the· message were _in ~lish, so that translation 

was not required.. 

@'pp roved for Release by NSA on 11-06-2013 pursuantto E .0. 1352a 
I 

Part 2 

Filed by the Japanet~ 10:30 p.m. 

6 Dec Tokyo time (1-r) 

Intercepted by Navy Station S 

1337-1343 GMT 6 Dec (!IT) 

Teletyped in Japanese code to !favy (N) 

:Received in Japanese code in Navy Dept 

1649 GMT.6 Dec (N) 

Decoded*and typed up at 'Navy (N) 

Part 3 

Yiled by the Japanese 10:40 p.m. 

6 Dec Tokyo time (N) 

Intercepted in Japanese code by Navy 

. Station S 1349-1358 GMT G·Dec (N) 

Teletyped in Japanese code to 1Tavy {N) 

Received in J'apanese code in Navy Dept. 

1__649 GMT 6 Dee {~) 

Decoded and typed up at Navy (N) 

Part 4 

Filed by the Japanese 11:55 p.m. 

6 Dec Tokyo time (N) 

Intercepted .in Japanese cod~ by Na"VJ" 

Station S 1505-1520 GMT 6 Dec (N) 

Teletyped in Japanese code to Navy (N). 

( 

Received in Japanese code in Navy Dept._ 

1649 GMT 6 Dec .(N) 

Decoded and typed up at Navy (N) 

Washington Time 

8:30 a.m. 6 Dec 

8:37-8:43 a.m. 

6 Dec 

11:49 a.m. 6 Dee 

6 Dec 

8:40 a.m. 6 Dec 

8:49-8: 58 a.m • 

6 Dec 

11:49 a.m. 6 Dec 

6 Dec 

9:55 a..m. 6 Dec 

10:0~10:20 a.m. 

6 Dec 

11:49 a.m. 6 Dec 

6 Dee 

\ •Actually the decode wa~ on t~e basi~_of a teletype troft N~vy St~tion 

M (Chol tenhM• Mnryl."'J':ld) i · :i.pparentiy ·received before teletype from 

Station S was received. 
c Part 5 

Fiied by the Ja~anese 11:59 p.m. 

6 Dec Tokyo time (N) 

Intercepted in Japanese code by Navy 

Station S, .1540-1546 GMT 6 Dec OT) 

Teletyped in J~panese code to Navy (W). 

Received in Japanese code in Navy Dept. 

l'.:l5l GMT 6 Dec (?ir) 

Decoded and typed up at.Navy (M) 

Part 6 

Filed by the Japanese 12:30 a.m. 

'f :Jee Tckyo time (lJ) 

Intercented in Japan~se code by Navy . 

Station S, 161_8-1624 GMT 6 Dec (iT) 

Teletyped in Japanese code to Navy Or) 

' -

.Received in Japanese code in Navy Dept. 

1951 GMT 6 Dec (N) . 

Decoded and typed up at Uavy (M) 

Part 7 .. -

Filed by the Jap!lllese 1:07 a.m. 

7 Dec Tokyo time {N) 

Intercepted in Japanese code by Navy 

Station S, 1605-1618 GMT 6 Dec Or) 

Teletyped in Japan~se ·code to Jfavy (l:r). 

Received in JapAAese code in Navy Dept~ 

1951 GMT 6 Dec (N) 

Decoded and typed up at Navy (N) 

Filed by the Japanese 1 :07 a •. m. 

7 Dec Tokyo time (N) 

Intercepted in Japanese code by Navy 

Station S, 1640-1658 GMT 6 Dec (W) ' -

Washington Time 

9:59 a.m. 6 Dee 

1oi4~10~46 a.m. 

6 Dec 

2: 51 p.m. 6 Dec 

6 Dec 

10:30 a.m. 6 Dee 

11:1a.:.1i': 24 · a~m. 

6 Dec· 

2:51 p.m. 6 Dec 

.. 

11:07 a.m. 6 Dec 

1.l:OS.-il:l8 a.m. 

6 Dec 

2:51 p.m. 6 Dec 

.·. 

11 :07 a. m. 6 Dec 

... 

ll:40-llt68 n.n. 

6 :Oec · 

. .- " . " ' 

. ' '. . ~ 

.•..:. 
Part 8 (Cont'd) ~ 

Teleptyped in J~panese code t~ Navy (N) 

Received in Jr1.panese code' in N?.vy Dept. 

1951 GMT 6 Dee (N) 

Decoded and typed up at Havy OT) 

Part 9 

Filed by Japanese 11:55 p.m. 

6 Dec Tokyo time (1:r) 

Intercepted in JapPnese code by N~vy 

Station S, 1530-1536 GMT 6 Dec 

Teletyped in J'apMese code to Navy {1r) 

Decoded by Army SIS (N) 

Typed at Navy (Nl 

Part lQ 

Filed b~ Japruiese ll:ES p.m. 

6 Dec Tokyo time {N) 

Intercepted in Japanese code by Navy 

Station S, 1517-1525 GMT 6 Dec (~) 

Teletyped in Japi:o,nese code to Navy (N) 

Decoded by Army SIS (N) 

Typed at Navy {N) 

Part 11 

Filed by the J'Rpanese 12:31 a.m. 

7 Dec Tokyo time (N) 

Intercepted in Ja.pruiese code by Nrwy 

Station S, 1607-1616 GMT 6 Dec (N) 

Teletyped in Jnpanese code to Navy (N). 

Received in Japanese code by Navy Dept. 

19.51 GMT 6 Dec (N) 

Decoded i:o.nd ~typed by Navy (N) 

) 

-4-

Washington Time 

2:51 p.m. 6 Dec 

6 Dec 

9:55 a.m. 6 Dec 

10:30-10:36 a.m. 

6 Dec 

6 Dec 

9:59 a.m., 6 Dec 

1-0:17-10: 25 

6 Dec 

6 Dec 

10:31 a.zn. 6 Dec 

11:07-11:16 a.m. 

6 Dec 

2:51 p.m. 6 Dec 

6 Dec 
PFtrt 12 

Filed by the JanPtnese 12-:49 a.m. 

? Dec Tokyo time (IT) 

Intercepted in JFtpanesc code by NF1.vy 

St~tion S, 1600-1608 GMT 6 Dec (F) 

Teletyped in Japt=l.nes'e code to Navy (N) 

Received in JFtpA.hese code by Navy Dept. 

1951 GMT 6 Dec (N) 

Decoded and typed by Navy (N) 

Part 13 ... 

Filed by the Japanese 1: 25 a.m •. 

7 Dec Tokyo time (!T) 

Intercepted .in J'apMese code by 1TA.vy 

Station S, 1635-1652 GMT 6 Dec (N) 

Teletyped in Japanese code to NFtvy (N). 

Received in JapM.ese code by Navy Dept. 

1951 GMT 6 Dec (W) 

Decoded and typed. by Navy (N) 

Part 14 

Filed by the Japanese 4:38 p.m. 

· 7 Dec Tokyo time (N) 

Intercepted in Japanese code by Navy 

Station S, 0805-0810 GMT 7 Dec (N) 

T'eletyped in Japanese code to 1Tavy o~r) 

Decoded and typed by Navy (N) 

Washington Time 

10:49 1'1...m. 6 Dec 

11:00-11:08 A.,m. 

6 Dec 

2: 5l p. m. 6 Dec 

6 Dec 

11:25 a..m. 6 Dec / 

11:35-11:52 l'l.,m. 

6 Dec 

2:51 p~m. 6 Dec 

6 Dec 

, 2:38 a,.m. 7 Dec 

3:05-::-3:10 a,m. 

7 Dec 

7 Dec 

No. 907 (one o•clock message~ p. 248 Exhibit 11 

Filed by the Japanese 6:18 p.m. 

? Dec Tokyo time. (N) 

Intercepted in Japanese code by 

i!TF.vy Station S (:Bainbridge Island, 

1'/'p"shington) 0937 GMT' 7 Dec (1-T) 

5-

4:18 a..m, 7 Dec 

4:37 a.m. 7 Dec 
c 

REF ID:A488471 

no, 907 (one o i clock mess."l.ge; p, ?.48 Exhibit 1) 

(Cont'd) WA.shington Time 

Teletyped in Japnnese code to lfav~r (A) 

Decoded by Navy (A) 

Sent by 1'Tiwy to ArMy SIS 

Trr>.nslated ~nd typed by Army 7 Dee 

SIS o~ b~sis of Navy decode (A) 

l:T9, 910 (code destruction; p, 249 Exhibit l) 

Filed by the Japanese 6:44 p.~. 

7 Dec Tokyo time (N & A) 

Intercepted in Jap~nese code by 

Navy Station S (Bainbridge Isl~nd, 

1fashington) 1007 GH!r 7 Dec (1T) 

Teletyped in J~p~nese code to Navy (A) 

Decoded by Navy (A) 

Sent by Mavy to Army SIS , 

Translated and typed by Army SIS 

on basis of Navy decode (A) 

4:44 a..m. 7 Dec 

5:07 a.rn. 7 Dec 

7 Dec