The United Kingdom, Japan and the United States sign the London Naval Treaty regulating submarine warfare and limiting shipbuilding. Date: April 22, 1930 Read more on Wikipedia → 📅 Other events on April 22 📅 Events on this day in 1930 📅 On This Day (Today)

World War II: Operation Persecution is initiated: Allied forces land in the Hollandia (currently known as Jayapura) area of New Guinea. Date: April 22, 1944 Read more on Wikipedia → 📅 Other events on April 22 📅 Events on this day in 1944 📅 On This Day (Today)

World War II: In Greenland, the Allied Sledge Patrol attack the German Bassgeiger weather station. Date: April 22, 1944 Read more on Wikipedia → 📅 Other events on April 22 📅 Events on this day in 1944 📅 On This Day (Today)

World War II: The 1st Air Commando Group using Sikorsky R-4 helicopters stage the first use of helicopters in combat with combat search and rescue operations in the China Burma India Theater. Date: April 22, 1944 Read more on Wikipedia → 📅 Other events on April 22 📅 Events on this day in 1944 📅…

World War II: Sachsenhausen concentration camp is liberated by soldiers of the Red Army and Polish First Army. Date: April 22, 1945 Read more on Wikipedia → 📅 Other events on April 22 📅 Events on this day in 1945 📅 On This Day (Today)

World War II: Prisoners at the Jasenovac concentration camp revolt. Five hundred twenty are killed and around eighty escape. Date: April 22, 1945 Read more on Wikipedia → 📅 Other events on April 22 📅 Events on this day in 1945 📅 On This Day (Today)

Arab–Israeli War: The port city of Haifa is captured by Jewish forces. Date: April 22, 1948 Read more on Wikipedia → 📅 Other events on April 22 📅 Events on this day in 1948 📅 On This Day (Today)

Korean War: The Chinese People's Volunteer Army begin assaulting positions defended by the Royal Australian Regiment and the Princess Patricia's Canadian Light Infantry at the Battle of Kapyong. Date: April 22, 1951 Read more on Wikipedia → 📅 Other events on April 22 📅 Events on this day in 1951 📅 On This Day (Today)

Red Scare: Witnesses begin testifying and live television coverage of the Army–McCarthy hearings begins. Date: April 22, 1954 Read more on Wikipedia → 📅 Other events on April 22 📅 Events on this day in 1954 📅 On This Day (Today)

American Flyers Airline Flight 280/D crashes on approach to Ardmore Municipal Airport in Ardmore, Oklahoma, killing 83. Date: April 22, 1966 Read more on Wikipedia → 📅 Other events on April 22 📅 Events on this day in 1966 📅 On This Day (Today)