Nazi Germany and Soviet Union Divide Poland, September 28, 1939

World War II: Pope Pius XII makes a Christmas Eve appeal for peace. Date: December 24, 1939 Read more on Wikipedia → 📅 Other events on December 24 📅 Events on this day in 1939 📅 On This Day (Today) More events from 1939RAF First Fighter Pilot Casualty in Friendly Fire, September 6, 1939World War…

World War II: The Battle of the Heligoland Bight, the first major air battle of the war, takes place. Date: December 18, 1939 Read more on Wikipedia → 📅 Other events on December 18 📅 Events on this day in 1939 📅 On This Day (Today) More events from 19391939-40 New York World’s Fair Opens…

World War II: The Estonian military boards the Polish submarine ORP Orzeł in Tallinn, sparking a diplomatic incident that the Soviet Union will later use to justify the annexation of Estonia. Date: September 14, 1939 Read more on Wikipedia → 📅 Other events on September 14 📅 Events on this day in 1939 📅 On This…

Spanish Civil War: The Nationalists conclude their conquest of Catalonia and seal the border with France. Date: February 10, 1939 Read more on Wikipedia → 📅 Other events on February 10 📅 Events on this day in 1939 📅 On This Day (Today) More events from 1939Finnish Government Resigns Amid Winter War, Parliament Moves to…

World War II: The German submarine U-47 sinks the British battleship HMS Royal Oak within her harbour at Scapa Flow, Scotland. Date: October 14, 1939 Read more on Wikipedia → 📅 Other events on October 14 📅 Events on this day in 1939 📅 On This Day (Today) More events from 1939Winter War Battle of Tolvajärvi Begins,…

J. Robert Oppenheimer and his student Hartland Snyder publish the Oppenheimer–Snyder model, proving for the first time in contemporary physics how black holes could develop. Date: September 1, 1939 Read more on Wikipedia → 📅 Other events on September 1 📅 Events on this day in 1939 📅 On This Day (Today) More events from…