 He attempted to occupy the island of Funen, however, his army was trounced at Mount Ochsenberg, near Assens, by a Danish army led by Johann Rantzau.John VII fell in that battle, as did many other noblemen, among them Nicholas of Tecklenburg, the Burgrave of Dohna, and Gustav Trolle, the Bishop of Uppsala.On 15 January 1525, he married Margareta Eriksdotter Vasa (d. 31 December 1536 in Tallinn).