The Nordic Seven Years War
The war took place in 1563–1570 between Sweden and united forces from Denmark and the German city of Lübeck. The two sides were fighting to gain control over the profitable Baltic Sea trade. The Danes also had a desire to re-create the Kalmar Union, a union that had joined the three kingdoms of Denmark, Sweden and Norway under one monarch. The war was fought largely at sea. Several battles were fought, of which the two biggest were those at Öland in May 1564 and at Bornholm in July 1565.