Atlas of Battles

battle, interwar and Second World War

Battle of Sejny

Battle of Sejny was a battle fought in 1920 in what is now Poland. Its exact site is not recorded; the atlas places it at its recorded location. It was part of the Polish–Soviet War, which ran from 1919 to 1921. The recorded result: Polish victory. Recorded strength: 20,000–30,000 against 7,000–8,000.

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Bitwa nad Niemnem, 1920.09.20-26
Bitwa nad Niemnem, 1920.09.20-26. Lonio17, CC BY-SA 4.0, via Wikimedia Commons.
Fought1920
WherePoland54.100N, 22.933E, placed at the location, approximate
OutcomePolish victory
BelligerentsSecond Polish RepublicagainstLithuania
Part ofPolish–Soviet War1919 to 1921

Where it sits in the Polish–Soviet War

Battles for Vilnius, 1918Battle of Bereza Kartuska, 1919Battle of Lida, 1919Battle of Warsaw, 1920Kyiv offensive, 1920Battle of Radzymin, 1920Battle of Wołodarka, 1920Battle of Lwów, 1920Battle of Dęblin and Mińsk Mazowiecki, 1920Lipno Operation, 1920Battle of Kock, 1920Battle of Daugavpils, 1920Battle of Letychiv, 1920Battle of Koziatyn, 1920Battle of Czarnobyl, 1920Battle of Berezina, 1920Battle of Głębokie, 1920Battle of Ladami, 1920Battle of Gieranony, 1920First Battle of Grodno, 1920Battle of Czortkowem, 1920Battle of Ostrołęka, 1920Battle of Zarębami Kościelnymi, 1920Battle of Łysowem, 1920Battle of Dorohuskiem, 1920Battle of Kaczkowem, 1920Battle of Mława, 1920Battle of Długosiodłem, 1920Battle of Makowem, 1920Battle of Przewodowem, 1920Battle of Ossów, 1920Battle of the Wkra, 1920Battle of Nasielsk, 1920Battle of Cyców, 1920Battle of Zadwórze, 1920Battle of Wyszków, 1920Battle of Mława (1920), 1920Battle of Białystok, 1920Battle of Komarów, 1920Battle of Sejny, 1920Battle of Dytiatyn, 1920Battle of Prużany, 1920Battle of the Niemen River, 1920Battle of Kojdanowem, 192019181920Battle of Sejny, 1920
47 placed engagements of the Polish–Soviet War in time order; taller ticks are more widely documented. Each tick is a link.

Record

Date1920 (year precision)
PlacePoland
54.100N, 22.933E
KindBattle, interwar and Second World War
Strength20,000–30,0007,000–8,000
Casualties and lossesUnknown2 officers and 32 soldiers KIA; 5 officers and 98 soldiers wounded; 38 officers and 1,700–1,996 soldiers captured
Commanders
  • Edward Śmigły-Rydz
  • Stefan Dąb-Biernacki
  • Kazys Ladiga
Battle of SejnyBattle of SejnyBattle of FilipówBattle of StrzelcowiznąBattle of Kozim RynkuBattle of GruszkamiBattle of RajgródBattle of FilipówBattle of StrzelcowiznąBattle of GruszkamiBattle of RajgródVilniusKaliningradKaunasHrodnaBiałystokSovetskOlsztynChernyakhovsk100 km54.100N, 22.933E
Placed at its recorded location; the exact site is not recorded. with the nearest other engagements in the atlas. Present-day coastlines, rivers and borders; towns from Natural Earth.

Nearest engagements

In the same war

Elsewhere in 1920

Battle of Sejny is one of 2,997 engagements of the 20th century in the atlas and one of 469 in present-day Poland.

Sources

Identity, coordinates, dates and the war from Wikidata Q9172649, released under CC0. Result, belligerents, commanders, strength and casualties from the infobox of the English Wikipedia article Battle of Sejny, revision 1382474448, read 2026-11-14, licensed CC BY-SA 4.0; the article's text is not reproduced here. Present-day country and state from Natural Earth. Dates before 1582 follow the Julian calendar as recorded.