Battle of Sejny (Side A vs Lithuania) took place in 1920 AD during Polish–Soviet War.
Wikipedia article on Battle of Sejny · Wikidata entry
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Battle of Sejny took place in 1920 AD. Side A vs Lithuania. Approx. Unknown*2 officers and 32 soldiers KIA 5 officers and 98 soldiers wounded 38 officers and 1,700–1,996 soldiers captured casualties. Part of Polish–Soviet War. Explore the interactive map and full Wikipedia details on WarAtlas. Please enable JavaScript to use the full app.