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September 1939 in Europe

  • French declaration of war on Germany (1939)The defensive treaty with Poland stood as the legal foundation for France's entry into conflict. This agreement obligated Paris to intervene if Berlin…
  • Siege of Warsaw (1939)The German Luftwaffe began its unrestricted aerial bombardment of Warsaw on the 1st of September 1939. This campaign targeted both military facilities and…
  • Invasion of PolandAt 4:45 a.m. on the 1st of September 1939, the pre-dreadnought battleship Schleswig-Holstein opened fire on the Polish military transit depot at Westerplatte…
  • Soviet invasion of PolandThe Peace of Riga treaty signed on the 18th of March 1921 drew a new line between Poland and Soviet Russia. This agreement divided disputed territories after…
  • Battle of the BzuraPoland's defense plan, known as Plan West, ordered troops to hold the nation's borders against a German invasion. Marshal Edward Rydz-Śmigły prioritized…
  • Battle of WesterplatteIn 1925, the League of Nations granted Poland the right to install a garrisoned ammunition depot near Danzig. An area on the Westerplatte peninsula was…