Battles on 1 September
37 battles fought (or begun) on 1 September, from 1600 to 2015, in date order. Dates are from Wikidata and are shown only for battles from 1600 onwards with a single exact date. Dates recorded in the Julian (Old Style) calendar are listed under their Julian day and marked.
Which battles happened on 1 September?
The best-known battles on this day (by number of Wikipedia language editions) are Battle of Sedan (1870), Battle of Westerplatte (1939), Defence of the Polish Post Office in Danzig (1939).
- Siege of Shiroishi 1 September 1600Japan
- Battle of Castelnaudary 1 September 1632France
- Siege of Salses 1 September 1639 – 6 January 1640France · Thirty Years' War
- Battle of Tippermuir 1 September 1644Scotland · Wars of the Three Kingdoms
- Battle of Chiari 1 September 1701Italy · War of the Spanish Succession
- Siege of Port Royal (1707) 1 September 1707Canada · Queen Anne's War
- Siege of Aligarh 1 September 1803 – 4 September 1803India · Second Anglo-Maratha War
- Battle of Ruona–Salmi 1 September 1808 – 2 September 1808Finland · Finnish War
- San Felipe incident (1835) 1 September 1835United States · Texas Revolution
- Siege of Petropavlovsk 1 September 1854Russia · Crimean War
- Battle of Four Lakes 1 September 1858United States · Coeur d'Alene War
- Siege of Tourane 1 September 1858 – 22 March 1860Vietnam · Cochinchina campaign
- Battle of Britton's Lane 1 September 1862United States · American Civil War
- Battle of Chantilly 1 September 1862United States · American Civil War
- Battle of Devil's Backbone 1 September 1863United States · Trans-Mississippi theater of the American Civil War
- Battle of Sedan 1 September 1870 – 2 September 1870France · Franco-Prussian War
- Battle of Lovcha 1 September 1877 – 3 September 1877Bulgaria · Tenth Russo-Turkish War
- Battle of Kandahar (1880) 1 September 1880Afghanistan · Second Anglo-Afghan War
- Battle of Fort Apache 1 September 1881United States · Apache Wars
- Battle of Ingalls 1 September 1893United States
- Battle of Masoller 1 September 1904Uruguay · Uruguayan revolution of 1904
- Affair of Néry 1 September 1914France · World War I
- Riga offensive (1917) 1 September 1917 – 3 September 1917Latvia · WWI Eastern Front
- Battle of Taiyuan 1 September 1937 – 9 November 1937China · Second Sino-Japanese War
- Battle of Chojnice (1939) 1 September 1939Poland · 1939 Invasion of Poland
- Battle of Częstochowa (1939) 1 September 1939 – 3 September 1939Poland · 1939 Invasion of Poland
- Battle of Danzig Bay 1 September 1939Poland · 1939 Invasion of Poland
- Battle of Grudziądz 1 September 1939 – 4 September 1939Poland · Battle of the Border
- Battle of Jordanów 1 September 1939 – 3 September 1939Poland · Battle of the Border
- Battle of Mokra 1 September 1939Poland · Battle of the Border
- Battle of Mława 1 September 1939 – 3 September 1939Poland · World War II
- Battle of Westerplatte 1 September 1939 – 7 September 1939Poland · 1939 Invasion of Poland
- Battle of Węgierska Górka 1 September 1939 – 3 September 1939Poland · Battle of the Border
- Charge at Krojanty 1 September 1939Poland · Battle of the Border
- Defence of the Polish Post Office in Danzig 1 September 1939Poland · 1939 Invasion of Poland
- 2010 Mardakert clashes 1 September 2010Azerbaijan · Nagorno-Karabakh conflict
- Battle of Janale (2015) 1 September 2015Somalia · Somali Civil War