This is a list of wars and war-like conflicts involving the modern Kingdom of Denmark and predecessor states.
*e.g. result unknown or indecisive/inconclusive, result of internal conflict inside Denmark, status quo ante bellum, or a treaty or peace without a clear result.
700–1300 Year War Belligerents (excluding Denmark) Outcome Allies Enemiesc. 770Harald Wartooth's invasion of Sweden DenmarkSwedenViking victory
Harald Wartooth subjugates a majority of Sweden c.770 Battle of Brávellir Denmark Wends Eastern Geats Sweden Estonians Western GeatsDefeat Harald Wartooth's death 780s-850 Viking invasions of England Norse Vikings Viking victory
Series of Viking attacks on Christian monasteries in the British Isles 810–811 Invasion of Frisia Danish Kingdom FranciaViking victory Treaty of Heiligen Danish border confirmed at The Eider 813Halfdan the Mild's revoltDanish KingdomHalfdan the MildRevolt successful
Denmark is expelled and Vestfold gains independence. 838Battle of Hingston DownDanish Vikings Cornwall Anglo-SaxonsDefeat Viking Defeat 845 Siege of Paris (845) Norse Vikings Francia Viking victory Viking plunder of Paris851Battle of AcleaDanish Vikings Kingdom of Wessex Defeat West-Saxon victory851Battle of SandwichDanish VikingsKingdom of KentDefeat Viking Defeat853Invasion of CourlandDanish Vikings Curonians Defeat Curonian victory859 Viking raid on NekorIbn-Adhari, translated in Stefansson, Jon, "The Vikings in Spain. From Arabic (Moorish) and Spanish Sources". In Saga-Book of the Viking Club: Vol. VI Proceedings. University of London King's College, 1909, pp. 40–41.(ca. 859) Norse Vikings Kingdom of Nekor Viking victory Vikings occupied Nekor for 8 days.865–878Great Heathen Army's invasion of EnglandNorse Vikings Norse–GaelsAnglo-Saxon kingdoms: Wessex Northumbria Mercia East Anglia Kingdom of StrathclydeKingdom of Alba Viking victory Treaty of Wedmore Establishment of Danelaw 866 Battle of Brissarthe Danish Vikings Francia Viking victory Frankish retreat 875 Battle of Dollar Danish VikingsScotland viking victory880 Battle of Thimeon Danish Vikings West FranciaDefeat Viking Defeat 881Battle of Saucourt-en-VimeuDanish Vikings West FranciaDefeat 9000 Vikings slain Vikings starts Raiding Lotharingia 882 Siege of Asselt Danish Vikings East Francia Defeat Godfrid became a vassal of Charles the Fat and converted to Christianity. 885 Battle of Rochester Danish Vikings Anglo-SaxonsDefeat Viking Defeat 885–886Siege of Paris (885–886)Danish Vikings West FranciaStalemate Paris successfully defended Vikings granted passage of the Seine and 700 livres (pounds) of silver Vikings raids continued into Burgundy 891 Battle of Leuven (891) Danish Kingdom East FranciaDefeat Death of Sigfried and Godfried 892 Battle of Farnham Danish Vikings Anglo-SaxonsDefeat Viking Defeat 893 Battle of Buttington Danish Vikings Mercia Wessex WelshDefeat Viking Defeat 894 Battle of Benfleet Danish Vikings Wessex MerciaDefeat Viking Defeat899–902Æthelwold's RevoltFollowers of Æthelwold æthelingSupported by:Danes of NorthumbriaKingdom of East AngliaFollowers of Edward the Elder: Wessex Mercia KentDefeat Victory for Edward the Elder902Battle of the HolmeDanish VikingsFollowers of Edward the Elder: Wessex Kent Viking victory Æthelwold killed Æthelwold's Revolt ended 900s Olof the Brashs conquest of Denmark Danish Kingdom Olof the Brash Defeat Victory for Olof 911Siege of Chartres (911) Danish Vikings West FranciaStalemate West Frankish military victory Treaty of Saint-Clair-sur-Epte Rollo is granted lands in northern France in exchange for vassalage, religious conversion and pledge to defend the Seine's estuary from viking raiders939Battle of Trans-la-Forêt Danish Vikings West Francia Defeat Decisive Breton victory955–961War between King Haakon the Good and the sons of Eirik Bloodaxe Sons of Eric Bloodaxe Kingdom of DenmarkDefeat Harald Greycloak becomes king of Norway.974German–Danish War of 974 Kingdom of Denmark Kingdom of Norway Norwegian RebelsDefeat Hedeby under German occupation from 974 to 981 mid-980s Sweyn's revolt against Harald Bluetooth Sweyn Forkbeard Harald Bluetooth Victory for Sweyn Forkbeard Harald Bluetooth exiled Sweyn becomes king of Denmark986 Battle of Fýrisvellir Kingdom of Denmark Jomsvikings SwedenDefeat Swedish Victory986 Battle of Hjörungavágr Kingdom of Denmark Jomsvikings Defeat Norwegian Victory986 Norwegian-Jomsviking War Kingdom of Denmark JomsvikingsDefeat Norwegian Victory Danish fleet destroyed992 Erik the Victorious invasion of Denmark Danish Kingdom SwedenDefeat Swedish victoryLagerqvist, Lars O., Sveriges regenter från forntid till nutid, Norstedts förlag, Stockholm 1996. (andra upplagan) Lagerqvist, Lars O., Sveriges regenter från forntid till nutid, Norstedts förlag, Stockholm 1996. (andra upplagan) page 27-30Erik Segersäll (1953) Sture Bolin. https://sok.riksarkivet.se/Sbl/Presentation.aspx?id=15407 mid-990s Eric the Victorious invasion of the Holy Roman Empire Danish Kingdom
Sweden Holy Roman Empire Stalemate Stade and Northern Germany gets pillaged and plundered by Vikings. Eric, however, fails to permanently capture land in the Holy Roman Empire. 1000 Battle of Svolder Kingdom of Denmark Sweden Earldom of LadeAllied Victory Partitioning of Norway Backlash against Christianity1001 First Battle of Alton Kingdom of DenmarkAnglo-Saxons Danish victory The Anglo-Saxons retreats to Winchester1001 Battle of Pinhoe Kingdom of Denmark Danish victory The Vikings burn Pinhoe to the ground1004 Battle of Thetford Kingdom of Denmark Anglo-SaxonsAnglo-Norwegian Victory1010 Battle of Ringmere Danish Vikings Anglo-Saxons Viking victory Over a three-month period the Danes wasted East Anglia, burning Thetford and Cambridge1013 Sweyn Forkbeards invasion of England Kingdom of Denmark Danish victory Sweyn Forkbeard becomes king of England and dies shortly after1015–1016Olav II's conquest of Norway(1015–1016) Raid on DenmarkKingdom of Sweden Kingdom of Denmark Earldom of OrkneyKingdom of NorwayDefeat The territorial changes following the Battle of Svolder are reversed1016Cnut the Great's invasion of England Kingdom of Denmark Kingdom of Norway Dano-Norwegian victory Personal union formed between Denmark and England in 1018. Following Edmund's death on 30 November, Cnut ascends to the throne as the sole king of England.1026Battle of Helgeå Kingdom of Denmark Kingdom of EnglandSweden Anglo-Danish victory Subjugation of parts of Sweden 1028–1029 Cnut's Invasion of Norway North Sea Empire Anglo-Danish victory Norway conquered1031 Battle of StiklestadThe "Peasant Army".loyal to Cnut the Great. Peasant victory Death of Olaf II of Norway1031 Cnuts expedition to Scotland North Sea Empire Kingdom of Scotland victory for the North Sea Empire Malcolm II, Maelbaethe and Lehmarc subjugated c.1034Annexation of Strathclyde Kingdom of Scotland North Sea EmpireKingdom of StrathclydeScottish victory kingdom of Strathclyde conquered1043 Magnus the Good's conquest of Denmark Denmark Wends Kingdom of Norway Danish LoyalistsDefeat Denmark reconquered Rebellion crushed Magnus the Good is kept king over both Norway and Denmark Sweyn Estridsson flees to Sweden1043 Battle of Lyrskov Heath Norway Danish Loyalists Wends Danish RebelsNorwegian and Danish Loyalist victory Up to 15.000 Wends killedJones, Gwyn (2001). A History of the Vikings. Oxford University Press. p. 403. . Battle of Lyrskov Hede.1043 Norwegian-Wendish War Norway Danish Loyalists Wends Danish RebelsNorwegian and Danish Loyalist victory Destruction the Viking fort Jomsborg, possibly to destroy the Danish competitors to the throne. Plundering of the Wendish town of Jumne. 1048–1064 Invasion of Denmark Denmark NorwayVictory Peace agreement, mutual recognition and Norwegian withdrawal.1049Blockade of Flanders Kingdom of Denmark County of Flanders Victory Successful blockade of Flanders in support of Henry III, Holy Roman Emperor1069–1075Danish attacks on Norman England Earl of Northumbria Norman EnglandStalemate Danegeld paid Unsuccessful reconquest of England 1086 Peasant rebellion in Vendsyssel peasants Defeat Death of Canute1093 Battle of Schmilau Prince Henry Saxony ObotritesVictory Victory for the Christian coalition 1096 Magnus's raids on Halland Defeat 1129Intervention in Szczecin Pomerania Kingdom of PolandPomeraniansDano-Polish Victory 1131–1157 Danish Civil War (Civil war) Valdemar Victory Valdemar I is made king of all of Denmark1136Erik Emunes invasion of Rügen RaniDanish Victory Rügen conquered and converted, but the Rani returned to their pagan belief after the Danes left. 1144–1147 Wendish Crusade Kingdom of PolandHoly Roman Empire Polabian SlavsWest SlavsVictory1168 or 1169Siege of Arkona RaniDanish Victory Rügen conquered and converted1170Battle of Julin Bridge PomeraniaDanish Victory entire army of Bogislaw scattered 1181 Battle of Dösjebro Royalists Scanian rebelsRoyalist Victory 1182 Harald Skraengs uprising Harald Skraeng SwedenDenmarkVictory Uprising quelled 1184 Battle of Greiswald Bay Pomerania Supported by: Holy Roman Empire Danish Victory1189–1192Third Crusade Angevin Empire Kingdom of France Kingdom of Jerusalem Knights Templar Knights Hospitaller Republic of Pisa Kingdom of Sicily Papal States Holy Roman Empire Duchy of Bohemia Armenian Kingdom of Cilicia Kingdom of Denmark Republic of Genoa Ayyubids Crusader Victory Treaty of Jaffa (1192) 1191 Danish Crusade of 1191 Finnish tribes Unknown result Canute VI claims victory 1192 Invasion of Bishop Valdemar Bishop Valdemar Supported by: Sweden Norway Hohenstaufen HolsteinRatzeburg Brandenburg Victory Bishop Valdemar is imprisoned1201Battle of Stellau County of HolsteinDanish Victory Holstein Subjugated 1201 Danish Crusade of 1201 Finnish tribes Indecisive Conquered regions handed over to SwedenOlesen, Jens E.. "The Swedish Expeditions (‘Crusades’) Towards Finland Reconsidered". Church and Belief in the Middle Ages: Popes, Saints, and Crusaders, edited by Kirsi Salonen and Sari Katajala-Peltomaa, Amsterdam: Amsterdam University Press, 2016, pp. 251-268. https://doi.org/10.1515/9789048525720-012 1203–1290 Livonian Crusade Sword-Brothers Livonian Order Denmark Sweden Indigenous peoples Livonians Latgalians Selonians Estonians Oeselians Curonians SemigalliansVictory Terra Mariana Duchy of Estonia1204–1208The Second Bagler War Bagler PartyBirkebeinerPeace Settlement of Kvitsøy Inge Magnusson becomes king of all of Norway 1210 Battle of Gestilren Denmark House of Sverker Sweden House of EricDefeat Eric X of Sweden becomes king of Sweden 1210 Invasion of Pomeralia Pomeralia Danish Victory Pomeralia subjugated1219 Battle of Lyndanisse Denmark Non-Christian EstoniansDanish Victory According to legend, Dannebrog fell from the sky, as an apparently helpful divine intervention, just when the Danish Crusaders were about to lose the battle to the local pagans. The flag has been the official flag of Denmark ever since, making it the world's oldest national flag still in use.1225 Battle of Mölln (1225) Denmark County of SchwerinDefeat Danish possessions in Germany rebels1227 Danish–German war Denmark County of Holstein Hanseatic LeagueDefeat Holstein regained independence Denmark forced to withdraw from northern Germany.1240–1242Livonian campaign against Rus' Danish Campaigns to Novgorod Livonian Order DenmarkNovgorod RepublicDefeat1245Battle of Embo Denmark Norway Kingdom of ScotlandDefeat 1250 Expedition against Frisia Frisian rebels Defeat Abel killed 1256-1257 Halland War Denmark Norway Defeat Norway renounces its claim on Halland Ingeborg marries Magnus VI of Norway1259-1261 The Archbishop War Margaret Lund ArchbishopricSchleswigRügenDefeat Plunder of Zealand Loss of Royal possessions in Schleswig1274-1275 The war against Valdemar Birgersson DenmarkMagnus III of Sweden SwedenVictory Valdemar, King of Sweden is deposed