That year he was stationed in the southern part of the Baltic Sea, where he counteracted the Imperial designs for a fleet based in Rostock, Warnemünde, Wismar, and Greifswald, also supporting the defense of Stralsund.
After having joined forces in May with Admiral Ove Gjedde at Flækkerø (present-day island of Flekkerøy outside of Kristiansand) they sailed together into the North Sea where on 25 May they fought an undecided action against a combined Swedish-Dutch fleet under Dutch admiral Marten Thijssen.
[4] [5] On 1 July 1644 he participated in the naval Battle of Colberger Heide, as Quarter Admiral leading the 4th squadron.
Again several of his ships' captains neglected their duties; at the very least, king Christian IV complained loudly about them, writing that they had used him as a shield between themselves and the enemy.
Pros Mund owned the family farm Bjerkevold in Eidanger, Norway and acquired Grevensvænge in Zealand.