DOCID: ' j7 ·4:2bS9 . .. ; .. ··•·· .. ·: .. /""'\lr:'lr"'I I\ I I '"'• 11 'y 1 , , '-'' l v1 r 1v1/-\L uvc Ul\JL 1: . .· . :---.- : -: .. · · .. .. -. - : . . . ··.. . .. . <·' . ·- • • • • • • • • • ••• • • •• • • •• • • • •• ••• : • .: • - .. • • • •• • I::" .: . : , .> , ·_ : · .. :. :, ; -,." --· :· . : . .. . . : . --:. :. .. _:: - ..:..-J: -: :: ·. .. .. : .. ·:- . . . . .. .. . . . . - . ··-:. "':"' .. : . • • • • • . • • :: : • • • • : ; • : • • • • : . .. ; • : tf . - .. • -1 ._:_;: .! ,.. • (U) The extjting voyage :9f. the . · .· naval stories or'\Yot4f·.W.ar rt, of the "· - German cruiser P:!TJ.z . daShtxfmtO: the @; • . ': , cruiser H.M.S. Hood, and wa.ci flruin.y .' coniered ana sμnk ... .. ships, is stilt an ex.citing tale, . . · .. · ·· .. ._ _:_: · ·- :.·'.-_"<.:.- . . :_" " I .• • ': .. .• ·. • • · (U) allied tiad .. _::·: sink the Bismarck.:· British at ·Bletchley· Parkha.d not . .. :. . German Kriegsmarjne (Navy) Enigma cipher · At the tjme .< .. .:;'.,'. . · · deployment, the British were roughly aw.eek or two late in re.ad.itlg the radio· surface ships. There were three instances in wbicb·aJlied COMfNT played a: discovery that the Bismarck would be heading to a .French that was derived. .. th¢ clue when radio control of the Bismarck switched from to German " the direqtion finding.fix when the German battleship broke tadio silence.ori .. :. initially rq)orted incorrectly either because it plotted :· : different from the one used by the British Admiralty}; of a ·. radio link that informed a senior officer that the Bismarckwooid arrive in France.= : '_·>. · ._ ·; '' -.: _._-. -· , .: .. ".-. • • • • • : • • .. : •• . • • ... • :·.;. • "l • • : (U) While Allied CQMINT played only a role, the · the role of German COMINT during this campaign? It is knoWn that · proficient and widespread effort centered in the organization known as·the .. _. , -. : Dienst, literally, the Observation Service. As it turns out, the mle of German COMJNT ' the outcome. Its achievements and failures, as well as the technical ignorance on the part of the task force commander, Admiral Gunther Lutjens, had much to · do with of the battleship Bismarck. · . ·:. .. · .. : .. . · . .. .. . ·: t·. : . -- . ; .. . (U) By the time of World War II, the Gennan navy had an establish¢, -: ... -.:· expert COMINT service. It was located in Section Two of the_ Qennan navy's · maintained a number of shore stations that bad intercept and direction finding :· · :· ,:; : :·· ... · German annies conquered more territory, the navy established new sites in Frartce,. the Balkans. During the 1930s, the B-Dienst had monitored the communication.$ of:the)' .. British navies and learned much about their procedures and cryptographic systems; d •• : · Spanish Civil War of 1936 to 1939. · . " .. · _. ::· · . '· ,. · 'i . . ' pproved for Release by NSA on 12-26-2006 pursuant to E.0 : 12958, ". · .... s amended MOR 51971 · · ... '1.· .. ·,,· .

M·:cltYr1oi~tc,~~Ac -: .. -. - · 2018. 8. 7. · DOCID: 'j7·4:2bS9 . UNCLASSIFIED/, /C~n , '-'' l /""'\lr:'lr"'I v1 r 1v1/-\L I\ I I uvc t~r-Ul\JL '"'• 11 'y 1 1: M·:cltYr1oi~tc,~~Ac

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DOCID: 'j7·4:2bS9 . ~. .. ; .. ··•·· .. ·: ..

UNCLASSIFIED//C~n /""'\lr:'lr"'I I\ I I t~r- '"'• 11 'y1 , , '-'' l v1 r 1v1/-\L uvc Ul\JL 1:

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· · .. M·:cltYr1oi~tc,~~Ac .. -. -: . . . ··.. . .. .
. 1;fr>C .. I ~ :::,. ·,;·3:74!2q~;~.::: ... "·:.:·,.:::::.:::·. :::;::;·;. ~:.:::.;·'.~~ .. ·;: ~; "· · ..

. . · - , . ·. . . , ! , . : .. -'. ::;;:·-::~'{:~f T=- :'.:;2~'. :; -,: (U) The first in.tluence of German CO MINT in th_e ·~_lsmar~k operation came Qn i,~~¥~Y~~~t(:;: {;}-'_

The Bismarck and Prinz Eugen had sailed from the area Ile$' 'Berge~ Norway, the pi--CViq~-~~y~;-~-:,- ~t~;';::::-'. desperate British aerial reconnaissance flight late on 22 Mai _discovered that the shlps.h84 ¥.ft;·:1ller._::~i-::,::-.:. aircraft radioed its report to its base. The German~ intetcep.~d tb:e message, but did no\ ,i~rt~tl\is ·t(>. ~~ ... Bismarck until the next day. (It is possible that the original .inte~ept .w~. from a.~~~~:~::::·, .::.i-:.>: unit, which might explain the delay.) Furthermore, the Bismar~kwas .rwi info~~.:g~~~:~!.;:~~;~;,:'::,>· ,· from COMINT, the German naval staff knew that major.elements f.th¢: 8rlti~h.'n~~~: ~;[~~9~~'.1~";: · :.:· already had left in purswt. The task force commanders. we-re ,angry over ,this lapse: fu;'.t~rtu,tg~ ;B.~·~/: :~ . time, the Bismarck, shadowed .by two British cruisers, HMS Stijfo'/IJ. and HMS.Noefol,k;:. w•~~~-~J~;:, forcing a passage to the North Atlantic via the Denmark Straits. Wh~ther th~ ·G~~;~~K,~~¢;~~:::;:-:: .::· have continued on this voyage knowing that the British home fleet had sallied out th 'it(~·,h ·Q:f(_:~:_.;;:':::~:· ~: · i_.·· retreated to Norway, is unknown. · · · .: . _ ·:

.. . ...

(U) On the morning of24 May, the B-Dienst teams aboard both the Bismarck_and-~c~>, ---> .. : ~-:·:·: Eugen intercepted the callsigns of two Royal Navy ~itafs~ps. One they could ide~~~;~_; __ -__:_/;-.·:: Hood. The other was new to them, but they could dt!termjtie from the call sign s.yst.e~ :tiiJ~(~·fw~~~-~~~F:: ~ ,;. battleship - it was the HMS Prince of Wales, which had d~arted with son:ie of i~ WQr~·~e'~f~tijF : .. ·< ·"'. ;.

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tfot! ti "~:'.' ·:j~t~f~t 59 , . '· "'' ·'···· . • , , • . .. < • ... 0 ,. . .. . .. :;::::,.• .: ;; ... . :1 : .. : .. ". .. ·'·' ... .. .

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(U) The·:.f\VQ .aertfian di··· ·s C.Oifull\ied :ciri a ·sciatiiert ~ .. R,-eallzin'". the Bts)ii~-~aa: ·. ". to make · ~- ·Adnlkt: L~t' · ~s-!.noo -th~:·p·" · tinz-i~ · ." :~l I I : . .

[(U/~bert J. Hanyo~ Center for Cryptologic History, rjhanyo, 972-2893s] .. :.. ._ .. - ·.

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