participating in a strike are killed in the Ludlow Massacre during the Colorado Coalfield War. 1918 – Manfred von Richthofen, a.k.a. The Red Baron, shoots down his 79th and 80th victims, his final victories before his death the following day. 1922 – The Soviet government creates South Ossetian Autonomous Oblast within Georgian SSR. 1945 – World War II: U.S. troops capture Leipzig, Germany, only to later cede the city to the Soviet Union. 1945 – World War II: Führerbunker: On his 56th birthday Adolf Hitler makes his last trip to the surface to award Iron Crosses to boy soldiers of the Hitler Youth. 1945 – Twenty Jewish children used in medical experiments at Neuengamme are killed in the basement of the Bullenhuser Damm school. 1946 – The League of Nations officially dissolves, giving most of its power to the United Nations. 1961 – Cold War: Failure of the Bay of Pigs Invasion of US-backed Cuban exiles against Cuba. 1968 – English politician Enoch Powell makes his controversial "Rivers of Blood" speech. 1968 – South African Airways Flight 228 crashes near the Hosea Kutako International Airport in South West Africa (now Namibia), killing 123 people. 1972 – Apollo program: Apollo 16 lunar module, commanded by John Young and piloted by Charles Duke, lands on the moon. 1998 – Air France Flight 422 crashes after taking off from El Dorado International Airport in Bogotá, Colombia, killing all 53 people on board. 1999 – Columbine High School massacre: Eric Harris and Dylan Klebold kill 13 people and injure 24 others before committing suicide at Columbine High School in Columbine, Colorado. 2007 – Johnson Space Center shooting: William Phillips with a handgun barricades himself in NASA's Johnson Space Center in Houston, Texas before killing a male hostage and himself. 2008 – Danica Patrick wins the Indy Japan 300 becoming the first female driver in history to win an Indy car race. 2010 – The Deepwater Horizon drilling rig explodes in the Gulf of Mexico, killing eleven workers and beginning an oil spill that would last six months. 2012 – One hundred twenty-seven people are killed when a plane crashes in a residential area near the Benazir Bhutto International Airport near Islamabad, Pakistan. 2013 – A 6.6-magnitude earthquake strikes Lushan County, Ya'an, in China's Sichuan province, killing more than 150 people and injuring thousands. 2015 – Ten people are killed in a bomb attack on