lost with all hands. March 15 – WWII: Italian submarine Leonardo da Vinci sinks Canadian Pacific liner RMS Empress of Canada off Sierra Leone. Nearly half of the 392 fatalities are Italian prisoners of war. German forces recapture Kharkiv after four days of house-to-house fighting against Soviet troops, ending the month-long Third Battle of Kharkiv. March 16–19 – WWII: 22 ships from Convoys HX 229/SC 122 and one U-boat are sunk in the largest North Atlantic U-boat "wolfpack" attack of the war. March 17 (Saint Patrick's Day) – Éamon de Valera, Taoiseach of the Republic of Ireland, makes the speech "The Ireland That We Dreamed Of", commonly called the "comely maidens" speech, in Dublin Castle. March 22 – WWII: Khatyn massacre – The entire population of Khatyn, Belarus is burnt alive by German occupation forces. March 23 – The drugs Vicodin and Lortab are first produced in Germany. March 26 – WWII: Battle of the Komandorski Islands: In the Aleutian Islands, the battle begins when United States Navy forces intercept Japanese troops attempting to reinforce a garrison at Kiska. March 27 – WWII: British Royal Navy escort carrier is destroyed by an accidental explosion in the Firth of Clyde, killing 379 of the crew of 528. March 28 – In Italy a ship full of weapons and ammunition explodes in the port of Naples, killing 600. April April 3 – Shipwrecked steward Poon Lim, BEM, is rescued by Brazilian fishermen after being adrift for 133 days. April 13 – WWII: Radio Berlin announces the discovery by Wehrmacht of mass graves of Poles killed by Soviets in the Katyn massacre. April 19 History of lysergic acid diethylamide: Albert Hofmann self-administers the psychedelic drug LSD (which he first synthesized in 1938) for the first time in history and records the details of his experience. The Holocaust: The Warsaw Ghetto Uprising begins when Nazi troops enter the Warsaw Ghetto to round up remaining Jews. April 21 – WWII: Aberdeen, Scotland, experiences its worst bombing, with 125 people killed. The first German Tiger I tank is captured in North Africa by British forces. April 25 – Easter occurs on the latest possible date (last time 1886; next time 2038) in the Western Christian Church. April 27 – The U.S. Federal Writers' Project ceases operation. May May 6 – WWII: Six U-boats are sunk, after sinking 12 ships from Convoy ONS 5, in the last