A British Bristol Blenheim bomber flying reconnaissance over Syria spots a German Junkers Ju90 transport aircraft at the Vichy French airfield at Palmyra. British government gives permission to enter Syrian air space (risking reprisals from the French). RAF fighters return to strafe the airfield, damaging 2 German Heinkel He111 bombers.
In anticipation of German invasion of Crete, British cruiser HMS Dido departs Suda Bay for Alexandria, Egypt, with £7,000,000 of Greek gold, escorted by destroyers HMS Stuart, Vendetta, Janus & Isis.
British gunboat HMS Gnat shells a mobile German gun battery on the coast near Tobruk, Libya.
500 miles West of South Africa (now Namibia), German armed merchant cruiser Atlantis sinks British SS Rabaul with shellfire after Rabaul fails to stop (7 crew killed, 47 crew and 4 passengers taken prisoner).