Timeline of World War II (1941) - September 1941

September 1941

• 1: With the assistance of Finnish armies in the North, Leningrad is now completely cut off.
  : A pro-German Government of National Salvation formed in the Territory of the Military Commander in Serbia under Milan Nedić.
• 4: The USS Greer becomes the first United States warship fired upon by a German U-boat in the war, even though the United States is a neutral power. Tension heightens between the two nations as a result. The US is now committed to convoy duties between the Western Hemisphere and Europe.
• 5: Germany occupies Estonia.
• 7: Berlin is heavily hit by RAF bombers.
• 8: Siege of Leningrad begins-a reasonable date to start measuring "the 900 days." German forces begin a siege against the Soviet Union's second-largest city, Leningrad; Stalin orders the Volga Deutsche deported to Siberia.
• 10: German armies now have Kiev completely surrounded.
• 11: Franklin D. Roosevelt orders the United States Navy to shoot on sight if any ship or convoy is threatened.
• 15: "Self-government" of Estonia, headed by Hjalmar Mäe, is appointed by German military administration.
• 16: Reza Pahlavi, Shah of Iran is forced to resign in favour of his son Mohammad Reza Pahlavi of Iran under pressure from the United Kingdom and the Soviet Union.
• 19: German capture of Kiev is now formal. The Red Army forces have suffered many casualties in defending this important city in the Soviet Union south.
• 26: The US Naval Command orders an all-out war on Axis shipping in American waters.
• 27: The National Liberation Front (EAM) is founded in Greece.
• 28: German SS troops kill over 30,000 Jews at Babi Yar on the outskirts of Kiev, Ukraine, in response to sabotage efforts which the Germans attributed to local Jews .
  : The first uprising in the Drama region in Greece against the Bulgarian occupation begins. It is swiftly put down, with ca. 3,000, mostly civilians, dead.