Enigma: 4th Problem

24 december 1941

Mr Alan Turing

 

We captured a submarine. In the radio room we
found the attached documents. Thanks to them, can
you decipher this message issued on December 15?

 

1650/15/103  58

NGLL ARXF FCOC FHZA SFSZ JAVL RYRC JTFY
KDBW LNYK JFFT POPI GHXJ QNCX HOAK LPQR
ISKN ZPAC YWRR IXRP WMUL XTZD GRCW BMSP
QVFE XTWE SPSN HKZS PEPH HXXT RLLN BGNX
XJED ZXOM TCDA STOQ FAPR THTH VKNF AZJZ
WXRR JOOY MUPW ZCOF JKME AJIF WNFM KWOX
LVBX NVSP MEKY CINB DMJQ NUNX XUSY VRXR
NGLL ARXF