 Since he had served in war in the Dutch navy, and had fine recommendations from Maurice of Nassau, Prince of Orange, King Frederick II conceded.In this context King Frederick mentioned the Oresund taxes which he was losing, when Dutch merchants sailed the northern route along the coast of Norway into the White Sea to trade with Russia, instead of taking the shorter route between Denmark and Sweden through Oresund.Hence Magnus got letters of marque to stop and confiscate any foreign ship that intended to travel north along the coast of Norway with one stipulation however