Siege of Älvsborg
1612 CE.
Shown on the map at 57.670°, 11.858°.
The siege of Älvsborg was a siege of the Swedish castle of Älvsborg by a Danish army under the command of Christian IV in the summer of 1612 as part of the Kalmar War. Despite the Swedes' strong defense, their commander Olof Andersson Stråle ultimately surrendered to the Danes' larger fighting forces.
Text from the Wikipedia article Siege of Älvsborg (1612), licensed CC BY-SA 4.0.