Vice Admiral William S. Sims, Commander, United States Naval Forces Operating in European Waters, to Rear Admiral Henry B. Wilson, Commander, United States Patrol Sqaudrons Operating in European Waters
Subject Copy File No.
Cablegram Sent 25 March 1918 JES
To Confran Brest Serial No. 1436
Prep. by C1 SX D.R.
1436. Owing to fact that submarines tend to operate in maximum numbers during moonlight periods as well as to advantages that submarines enjoy in delivering attacks on moonlight nights, I have requested Department to arrange sailings of convoys to pass through most dangerous areas during day<light> during a period of about six days on each side of full moon. 1436. <14325.>
Source Note: Cy, DNA, RG 45, Entry 517B.