Britain: Admiralty Anti-Submarine Division director urges general convoy system, Jellicoe approves trial convoy from Gibraltar.
Schooner Q-ship (NZ skipper Sanders wins Victoria Cross) Prize (first German ship Else captured in 1914) damages U-93 (11 ships sunk on her first cruise) and captures her captain Spiegel plus 2 other crew members, but U-boat gets home (sunk on January 7, 1918 by SS Braeneil ramming). Q-Ship Prize sunk with all hands by U-48 on August 14, 1917.
Salonika: Continued Bulgar attacks and shelling of Hill 380 (their old front line) and on April 28. Sarrail postpones offensive to West due to bad weather.
Mesopotamia: Marshall reconnaissance Ali Ihsan’s Band-i-Adhaim position (dug since April 23). Dust storms and great heat (110°F+) prevent much shelling (until April 29).