Naval History and Heritage Command

Naval History and Heritage Command

Admiral William S. Benson, Chief of Naval Operations, to Vice Admiral William S. Sims, Commander, United States Naval Forces Operating in European Waters

Action Copy.

Cablegram Received  April <6, 1918,> 10407   TCH1

Origin Opnav Washington (Navintel)                 Ser. No. 4694

Ref’d. to




7 April

<JHR @ Admiralty interrogated->2








     25 D           VERY SECRET


4694.     Reliably informed that 1 submarine will sail shortly from Germany for Mexico with military mission and Arms. Believed that may be U-151 converted into submarine cruiser.3 Confirmation requested. 13006, 4694


Source Note: Cy, DNA, RG 45, Entry 517B.

Footnote 1: Initials of the transcriber.

Footnote 2: “JHR” has not been further identified.

Footnote 3: U-151 was a class of large, long-range submarines. They were initially constructed to be merchant submarines but were converted to military use. Uboat.Net, Accessed on 28 March 1918, There is no evidence that a German U-boat visited Mexico in the spring of 1918.

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