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Polish–Lithuanian War

The Polish–Lithuanian War was an undeclared war between newly independent Lithuania and Poland following World War I, which happened mainly in the Vilnius and Suwałki regions. The war is viewed differently by the respective sides. Wikipedia
Dates: Sep 1, 1920 – Oct 7, 1920
Territorial changes: Suwałki and Vilnius regions attached to Poland (with some adjacent areas)