Editing 1943 (section)

===September===
{{Main|September 1943}}
* [[September 3]] – WWII: [[Allied invasion of Italy]]
** [[Armistice of Cassibile]]: The [[Kingdom of Italy]] surrenders to the [[Allies of World War II|Allies]] in a document signed on [[Sicily]] but not made public at this time.
** [[Operation Baytown]]: Mainland Italy is invaded by Allied forces under General [[Bernard Montgomery, 1st Viscount Montgomery of Alamein|Bernard Montgomery]], for the first time in the war.
* [[September 5]] – WWII: [[Landing at Nadzab|US landing at Nadzab]]: The [[503rd Infantry Regiment (United States)|503rd Parachute Regiment]] under Colonel [[George M. Jones|George Jones]] lands and occupies [[Nadzab]], just east of the port city of [[Lae]], in northeastern [[Papua New Guinea]].
* [[September 7]] – [[Gulf Hotel fire]]: A fire at the Gulf Hotel in [[Houston, Texas]] kills 55.
* [[September 8]] 
** WWII: United States General [[Dwight D. Eisenhower]] publicly announces the surrender of Italy to the [[Allies of World War II|Allies]].
** WWII: [[Frascati air raid]]: The USAAF bombs the German General Headquarters for the Mediterranean zone.
** WWII: The city of [[Donetsk]] (the capital of [[Donbas]]) is liberated by Soviet forces as a part of the successful [[Donbas strategic offensive (August 1943)|Donbas operation]].
** The first classes commence at [[Grace University]] in [[Omaha, Nebraska]].
* [[September 9]] – [[Bertolt Brecht]]'s play ''[[Life of Galileo]]'' ({{Langx|de|Leben des Galilei}}) receives its first theatrical production, at the [[Schauspielhaus Zürich]].
* [[September 12]] – WWII: [[Gran Sasso raid]] – German paratroopers rescue Mussolini from imprisonment, in ''Unternehmen Eiche'' ("Operation Oak").
* [[September 16]] – WWII: [[Salerno Mutiny]] – Soldiers of the [[British Army]]'s [[X Corps (United Kingdom)|X Corps]] refuse postings to new units.
* [[September 17]] – WWII: Villefranche-de-Rouergue Mutiny – A group of pro-[[Yugoslav Partisans|Partisan]] soldiers, led by [[Ferid Džanić]] and others within the [[13th Waffen Mountain Division of the SS Handschar (1st Croatian)]], training in [[occupied France]], rise against [[Nazi Germany|Nazi German]] troops in the Division; the revolt is rapidly suppressed.
* [[September 21]]–[[September 26|26]] – WWII: [[Massacre of the Acqui Division]] – German soldiers of the [[1st Mountain Division (Wehrmacht)]] kill over 5,100 [[Italian military internees]] resisting disarmament on the Greek island of [[Cephalonia]].
* [[September 22]]–[[October 2]] – WWII: [[Landing at Scarlet Beach]] on the [[Huon Peninsula]] of [[New Guinea]] by Allied forces, the first time Australian troops have made an opposed amphibious landing since the [[Gallipoli Campaign]] of [[1915]]. 
* [[September 23]] – WWII: The [[Italian Social Republic]] ("Republic of Salò") is founded in northern Italy as a [[puppet state]] of [[Nazi Germany]].
* [[September 25]] – WWII: The Russian city of [[Smolensk]] is liberated by Soviet forces as a part of the successful [[Smolensk operation]].
* [[September 27]] – WWII: [[Four days of Naples]] begins: a popular uprising drives German occupying forces from the city.