In 1534, the Danish Count's Feud spilled over into the Low Countries when Habsburg supported Enno II, Count of East Frisia, ally of Christopher of Oldenburg and Charles, Duke of Guelders supported Balthasar Oomkens von Esens, ally of Christian III of Denmark.
In May 1536, Meindert van Ham, supported by Denmark and Guelders, invaded Groningen and threatened Holland.