Britain: Massive night raids on London. Approx. 300 bombers (6 lost) make 2-3 sorties each (total sorties 685), dropping over 1,000t of bombs and mines, causing widespread damage and many fires. The attack was a reprisal for RAF raid on Berlin on April 9.
Mediterranean: Italian convoy of 5 transports with 3 destroyers annihilated by 4 British destroyers off Cape Bon (Tunisia); HMS Mohawk lost.
Germans capture Sarajevo.