Battles on 20 September
24 battles fought (or begun) on 20 September, from 1600 to 2017, 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 20 September?
The best-known battles on this day (by number of Wikipedia language editions) are Battle of Valmy (1792), Battle of the Alma (1854), Battle of Chickamauga (1863).
- Battle of Moyry Pass 20 September 1600 – 9 October 1600Northern Ireland · Nine Years' War
- Siege of Ostend 20 September 1604Belgium · Eighty Years' War
- First Battle of Newbury 20 September 1643 (Julian calendar)England · First English Civil War
- Battle of Trembowla 20 September 1675 – 11 October 1675Ukraine · Polish–Ottoman War of 1672–1676
- First Battle of Höchstädt 20 September 1703Germany · War of the Spanish Succession
- Raid on Lorient 20 September 1746France · War of the Austrian Succession
- Battle of Paoli 20 September 1777United States · American Revolutionary War
- Battle of Valmy 20 September 1792France · War of the First Coalition
- Battle of Pont-Barré 20 September 1793France · War in the Vendée
- Second siege of Missolonghi 20 September 1823 – 30 November 1823Greece · Greek War of Independence
- Battle of Villarrobledo 20 September 1836Spain · First Carlist War
- Battle of the Alma 20 September 1854Ukraine · Crimean War
- Battle of Chickamauga 20 September 1863United States · American Civil War
- Ganghwa Island incident 20 September 1875South Korea · history of Japan–Korea relations
- Battles of Zanzur (1912) 20 September 1912Libya · Italo-Turkish War
- Battle of Zanzibar 20 September 1914Tanzania · World War I
- Battle of the Menin Road Ridge 20 September 1917 – 26 September 1917Belgium · Third Battle of Ypres
- Capture of Wurst Farm 20 September 1917Belgium · Third Battle of Ypres
- Battle of Nazareth 20 September 1918 – 21 September 1918Israel · Middle Eastern theater of World War I
- Battle of Grodno (1939) 20 September 1939 – 24 September 1939Belarus · 1939 Invasion of Poland
- Battle of Nanpeng Archipelago 20 September 1952 – 20 October 1952At sea · Chinese Civil War
- First Battle of El Djorf 20 September 1955 – 28 September 1955Algeria · Algerian War
- Bokhundjara incident 20 September 2007Georgia · Abkhazia conflict
- Battle of Hawija 20 September 2017 – 8 October 2017Iraq · Iraqi Civil War of 2014–2017