Britain: British airship SS1 snares telegraph wires and crashes in flames. First coastal station for anti-submarine patrol airships opened at Capel (Folkestone).
Ypres – Battle of Frezenberg Ridge (until May 13): Germans take ridge after heavy bombardment from 0530 hours of British V Corps front which has only 18 heavy guns. Gallant stand by British, 84th brigade almost wiped out, but line gives only 1000 yard (until May 13).
Artois: French blow 5 mines in prelim operation (night May 8-9) but lose objective to counter-attack.
Canada: War Purchasing Commission formed.