Denmark–Norway had a reputation as a relatively powerful kingdom at this time. European politics of the 16th century revolved largely around the struggle between Catholic and Protestant forces, so it seemed almost inevitable that Denmark, a strong, unified Lutheran kingdom, would get drawn into the larger war when it came. The Thirty Years' War went badly for the Protestant states in the early 1620s, and a call went out to Denmark–Norway to "save the Protestant cause".
denmark–norway had a reputation as a relatively powerful kingdom at this time european politics of the 16th century revolved largely around the struggle between catholic and protestant forces so it seemed almost inevitable that denmark a strong unified lutheran kingdom would get drawn into the larger war when it came the thirty years' war went badly for the protestant states in the early 1620s and a call went out to denmark–norway to "save the protestant cause"