H.M.S. Vindictive (obsolete cruiser), damaged in the raid on Zeebrugge, is successfully sunk across the entrance to Ostend harbour.
May 11 (Sat.)
Mesopotamia:—The British, advancing along the Baghdad-Mosul road, drive the Turks across the Lesser Zab (70 miles from Mosul).
A British submarine destroys a German submarine of the 'cruiser' type.
May 14 (Tues.)
An Italian motor boat enters the port of Pola and sinks an Austrian battleship.
The British destroyer Phœnix is sunk by a submarine in the Adriatic.
May 15 (Wed.)
The French advance their line north of Kemmel Hill.