The Battle of Csis (Latvian: Csu kaujas; Estonian: Vnnu lahing, Battle of Vnnu; German: Schlacht von Wenden, Battle of Wenden), fought near Csis (or Vnnu, Wenden) in June 1919, was a decisive battle in the Estonian War of Independence and the Latvian War of Independence. After heavy fighting an Estonian force moving from the north, supplemented by Latvian units, repelled Baltic German attacks and went on full counter-attack.

The Estonian War of Independence (Estonian: Vabadussõda, literally "Freedom War"), also known as the Estonian Liberation War, was a defensive campaign of the Estonian Army and its allies, most notably the United Kingdom, against the Bolshevik westward offensive of 1918–1919 and the 1919 aggression of the Baltische Landeswehr. The campaign was the struggle of the newly established democratic nation of Estonia for independence in the aftermath of World War I. It resulted in a victory for Estonia and was concluded in the 1920 Treaty of Tartu.