Sea War
Atlantic: Swordfish torpedo-bombers score two hits on battleship Bismarck, disabling her steering-gear; the battleship’s AA gunners are confused by the slow-flying biplanes. 5 destroyers harass Bismarck during night May 26-27.
Mediterranean: British aircraft carrier Formidable launches air strike against Stuka base on Scarpunto Island, east of Crete . Later Formidable and escorting destroyers are bombed by Ju 87 Stukas; carrier badly damaged.
Air War
Airborne invasion of Crete: German airborne troops take Chania, capital of Crete.
Neutrals
Irish Republic: Prime Minister De Valera cautions Churchill against introduction of conscription in Northern Ireland (Churchill concedes May 27).
USA: Air raid black-out test in Newark, New Jersey.