He served as commander for the Norwegian forces during the Kalmar War between Denmark-Norway and Sweden from 1611 to 1613.
Although a side-note to the war, the Battle of Kringen, in which Scottish mercenary forces were defeated by Gudbrandsdal militiamen from Lesja, Dovre, Vaage (Vågå), Fron, Lom and Ringebu is a noted military event in Norway, celebrated to this day.
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In the Swedish - Danish war (1611–13), the so-called Kalmar war, Jens Munk together with the nobleman Jørgen Daa led a successful attack on the Swedish fortress Älvsborg in 1612, near today's Gothenburg.