Atlas of Battles

naval engagement, medieval

Battle of Sejerø

Battle of Sejerø was a naval engagement fought in 1132 at Sejerø, in what is now Denmark. Its exact site is not recorded; the atlas places it at Sejerø. It was part of the Danish Civil Wars, which ran from 1131 to 1157. The recorded result: Party of Eric Ericson Victory. Recorded strength: ~120–240 against ~100–200.

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Fought1132
WhereSejerø, Denmark55.883N, 11.150E, placed at the location, approximate
OutcomeParty of Eric Ericson Victory
BelligerentsDenmarkagainstSweden
Casualties and lossesMinorandAll but one
Part ofDanish Civil Wars1131 to 1157

Where it sits in the Danish Civil Wars

Battle of Jellinge Heath, 1131Siege of Schleswig, 1131Battle of Sejerø, 1132Battle of Værebro, 1133Battle of Fotevik, 1134Battle of Grathe Heath, 115711311157Battle of Sejerø, 1132
6 placed engagements of the Danish Civil Wars in time order; taller ticks are more widely documented. Each tick is a link.

Record

Date1132 (year precision)
PlaceSejerø, Denmark
55.883N, 11.150E
KindNaval engagement, medieval
Strength~120–240~100–200
Casualties and lossesMinorAll but one
Commanders
  • Eric II of Denmark
  • Magnus the Strong
Battle of SejerøBattle of SejerøBattle of Zealand Point1982 Harpoon Missile Misfire IncidentBattle of IsefjordAarhus Air RaidSkirmish of ÅrhusAarhus Air RaidSkirmish of ÅrhusKøbenhavnOdenseAalborgFlensburgHelsingborgEsbjergHalmstadSvendborg100 km55.883N, 11.150E
Placed at Sejerø; 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 1132

Battle of Sejerø is one of 459 engagements of the 12th century in the atlas and one of 74 in present-day Denmark.

Sources

Identity, coordinates, dates and the war from Wikidata Q107176023, released under CC0. Result, belligerents, commanders, strength and casualties from the infobox of the English Wikipedia article Battle of Sejerø, revision 1370588962, 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.