He set sail in Enkhuizen , together with his uncle John , Duke of Beaumont , and landed near Stavoren and Laaxum but he was however ambushed and killed , in a battle known as the battle of Warns .
He set sail in Enkhuizen , together with his uncle John , Duke of Beaumont , and landed near Stavoren and Laaxum . 
 He was , however , ambushed and killed , in a battle known as the Battle of Warns .