Vice Admiral William S. Sims, Commander, United States Naval Forces Operating in European Waters, to the Office of the Chief of Naval Operations
Subject Copy. File No. <4-18-3>
Cablegram Sent August 21 1918 EJW
To Opnav Washington. Serial No. 3307
Prep. by A-1 SX D.R.
3307. U.S.Naval Northern Bombing Group commenced offensive operations night of August 15, dropping 1250 pounds explosive on enemy submarine docks at Ostend. 212721 3307.
Source Note: Cy, DNA, RG 45, Entry 517B.