Ypres: Franco-Belgian advance near Het Sas and Steenstraate. British relieve French of 3 miles south of La Bassee canal (night 14-15) as 400 guns prepare Haig’s next blow.
Austro-Italian border: Advanced detachments of 3 Austrian divisions from Poland detrain on Isonzo line, main VII Corps body reach Agram.
Mesopotamia: Gorringe captures Arab fort in Persian Arabistan, but Turks withdraw to Amara. 2 British aircraft reach Basra, first flights on May 27.
Baltic: Russian submarine Drakon twice vainly attacks German cruiser Thetis (initially towing U4).
Britain: War Council meets, Kitchener accuses Admiralty, fears invasion. Churchill stiffens Gallipoli resolve.
The Times military correspondent highlights BEF shell shortage in dispatch prompted by Field Marshal French. Press blame Kitchener.
Venetia Stanley tells shattered Asquith she is marrying E Montague and ceasing correspondence.
Portugal: Navy and Democrats overthrow General Castro ‘dictatorship’ (1,150-1,300 casualties until May 1B). Castro deported to Azores, later flees to Germany.