thumb|right|400px|Polish-Soviet, Latvian-Soviet and Lithuanian-Soviet Wars in 1919-1920: Polish and Latvian counterattacks.
The Battle of Daugavpils, or Battle of Dyneburg, or Operation Winter was the final battle during the Polish–Soviet War of 1919. A joint Polish and Latvian force, operating under Polish Staff orders known as "Operation Winter", attacked the Red Army garrison in Dunaburg, or Daugavpils, from 3 to 5 January 1920.
From the Polish perspective, the battle was part of the Polish–Soviet War. In Latvia, it is considered to be part of Latvian War of Independence.
Background
The Polish commander of the 1st Legions Infantry Division and 3rd Legions Infantry Division, General (later Marshal) Edward Rydz-Śmigły had been occupying the left bank of the Dvina since August. The Latvian Foreign Minister had met with Pilsudski in Vilnius (then Wilno in Polish) in October 1919 and asked for assistance at Dunaburg. The Poles wanted to prevent the Soviet XVth and XVIth armies from consolidating at that juncture and readily agreed.
Several forms of alliance were proposed by Poland, such as Latvia joining the Międzymorze, a federation led by Poland. However, Latvia chose instead to join the Baltic Entente.
See also
- List of battles of the Polish–Soviet War