The Kalmar War (1611-1613) was a conflict between the Kingdom of Denmark-Norway and the Swedish Empire. The war arose from territorial disputes and competition for control over trade routes in the Baltic Sea. It was marked by naval battles and skirmishes on land, with both sides seeking to expand their influence in the region. The war concluded with the Treaty of Köpenhamn in 1613, which restored the status quo and ended hostilities. Although neither side gained significant territory, the conflict highlighted the ongoing rivalry between Denmark-Norway and the Swedish Empire during the early 17th century.