Vice Admiral William S. Sims, Commander, United States Naval Forces Operating in European Waters, to the Office of the Chief of Naval Operations
DISPATCH TO BE SENT.
Date: September 1, 1918.
Prepared by: CS Approved Code 46 ADR No. 3959
3959 Your 724 my 3947. The Admiralty suggest that in order to avoid probable confusion and misunderstanding the proposed message “Battle-cruiser Raid Plan Operative” be sent out in a code known only to United States ships should it be necessary to send it out before an agreement on a joint plan has been reached with Admiralty and all vessels are made cognizant of the plan. I concur in this suggestion as I think any other procedure would result in confusion and uncertainty and would lead to excessive radio work by convoys at sea. 191701 3959 SIMS.
Source Note: Cy, DNA, RG 45, Entry 517B.