conspirators Wilhelm Canaris, Hans Oster and Hans von Dohnányi are hanged at Flossenberg concentration camp, along with pastor Dietrich Bonhoeffer. Johann Georg Elser, would-be assassin of Adolf Hitler, is executed at Dachau concentration camp. April 10 – WWII: Visoko is liberated by the 7th, 9th and 17th Krajina Brigades from the Tenth Division of Yugoslav Partisan forces. April 11 – Buchenwald concentration camp is liberated by the United States Army. April 12 Vice President Harry S. Truman is sworn in as the 33rd President of the United States, and that evening in the White House, following the sudden death of President Franklin D. Roosevelt earlier in the day. WWII: The U.S. Ninth Army under General William H. Simpson crosses the Elbe River astride Magdeburg, and reaches Tangermünde — only 50 miles from Berlin. April 14 – WWII: The First Canadian Army assumes military control of the Netherlands, where German forces are trapped in the Atlantic Wall fortifications along the coastline. Razing of Friesoythe: The 4th Canadian (Armoured) Division deliberately destroys the German town of Friesoythe, on the orders of Major General Christopher Vokes. April 15 – WWII: The Bergen-Belsen concentration camp is liberated by British and Canadian forces. The Canadian First Army reaches the coast in the northern Netherlands, and captures Arnhem. April 16 – WWII: The Battle of Berlin begins, opening with the Battle of the Oder–Neisse and the Battle of the Seelow Heights. Canadian forces take Harlingen and occupy Leeuwarden and Groningen in the Netherlands. is sunk by Soviet submarine L-3 in the Baltic Sea while evacuating German troops and civilians as part of Operation Hannibal; 7,000–8,000 drown. Death marches from Flossenbürg concentration camp begin. April 17 – WWII: Brazilian forces liberate the town of Montese, Italy, from German forces. Inundation of the Wieringermeer in the Netherlands by occupying German forces. April 18 – American war correspondent Ernie Pyle is killed by Japanese machine gun fire on the island of Ie Shima off Okinawa. April 19 – Rodgers and Hammerstein's Carousel, a musical play based on Ferenc Molnár's Liliom, opens on Broadway, and becomes their second long-running stage classic. April 20 – WWII: On his 56th birthday, Adolf Hitler leaves his Führerbunker, to decorate a group of Hitler Youth soldiers in Berlin. It will be his last trip to the surface from his underground bunker. April 22 – WWII: Heinrich Himmler, through Folke Bernadotte, Count of Wisborg, puts