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Vice Admiral William S. Sims, Commander, United States Naval Forces Operating in European Waters, to Vice Admiral Sir Roger Keyes, Commander, Dover Patrol


April 23rd 1918.        

My dear Admiral,

          Referring to your letter of April 10th,1 the members of my Planning Section have now returned from Queenstown and the following are the only suggestions they have to make concerning possible operations in the Dover Straits:-

1.  A sound barrage established somewhere between Dover and Ostend. This is by means of what is known as the K tube, the object of which is to notify the approach of submarines through these appliances. They have worked out rather successfully on the other side and I believe they have been considerably improved since then. We are also going to install them in the Otranto Straits.

2.  It is thought a surface barrage would of course be very useful, providing a mine can be devised that will ensure that it will stay at a constant depth below the surface during all states of the tide and current. The problem of developing such a mine and gear was suggested for solution byour own Bureau of Ordnance, but I do not know what progress has been made. I realize of course, that this is a difficult proposition; that any appliance that is supposed to work automatically month after month under water must be a very good one indeed.

          Needless to say we are all rejoicinger [i.e., rejoicing over] the success of the gallant operation that was carried out last night against Zeebrugge and Ostend.2 This should have a very marked deterrent effect upon the small submarines and will surely have a very great moral effect upon all of the Allies.

Very sincerely yours,        

Source Note: TL, DLC-MSS, William Sims Papers, Container 23. “Admiral Sims’ personal file.” appears in the upper-left corner, with identifier “AB” just below it. Identification numbers “1/2/J/A/D” appear on the upper-right side of the page in columnar fashion. Addressed below close: “Vice Admiral Sir Roger Keyes, R.N.,/Admiral’s Office,/Dover.”

Footnote 1: This letter has not been found.

Footnote 2: The Royal Navy attempted to block the ports of Zeebrugge and Ostend, two Belgian ports that were among the primary departure points for submarines. On the night of 23 April, they sank several outdated ships in the canal. Ultimately, the raids accomplished little, as the Germans easily reopened the canals and normal submarine traffic resumed. See: Sims to Pratt, 29 April 1918, for a more detailed discussion of the raids.

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