Battles on 21 April

19 battles fought (or begun) on 21 April, from 1664 to 2013, 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 21 April?

The best-known battles on this day (by number of Wikipedia language editions) are Second Battle of Ypres (1915), Battle of San Jacinto (1836), Battle of Reichenberg (1757).

• Siege of Kanizsa (1664) 21 April 1664 – 30 May 1664Hungary
• Battle of Satara 21 April 1700India · battles involving the Maratha Empire
• Battle of Reichenberg 21 April 1757Czechia · Seven Years' War
• Battle of Mondovì 21 April 1796Italy · French Revolutionary Wars
• Battle of the Raz de Sein 21 April 1798France · French Revolutionary Wars
• Action of 21 April 1806 21 April 1806South Africa · Napoleonic Wars
• Battle of Colonia del Sacramento (1807) 21 April 1807 – 22 April 1807Uruguay · British invasions of the River Plate
• Battle of Landshut (1809) 21 April 1809Germany · War of the Fifth Coalition
• Battle of Ronco 21 April 1815Italy · Neapolitan War
• Battle of San Jacinto 21 April 1836United States · Texas Revolution
• Battle of Las Carreras 21 April 1849 – 22 April 1849Dominican Republic · War of Dominican Independence
• Battle of Leybar Bridge 21 April 1855Senegal
• Battle of Genėtiniai 21 April 1863Lithuania · January Uprising
• Second Battle of Ypres 21 April 1915 – 25 May 1915Belgium · Western Front
• Battle of Istabulat 21 April 1917Iraq · Mesopotamian campaign
• Battle of Hyvinkää 21 April 1918Finland · Finnish Civil War
• Battle of Haifa (1948) 21 April 1948 – 22 April 1948Israel · 1947–1948 Civil War in Mandatory Palestine
• Battle of Wazzin 21 April 2011 – 29 July 2011Libya · Nafusa Mountains campaign
• Battle of Ber (2013) 21 April 2013Mali · Mali War