Claim: Dutch leaders Louis and Henry of Nassau, younger brothers of William the Silent, Prince of Orange, died in the Battle of Mookerheyde near the village Mook in Gelderland.
Evidence: Two leaders of the Dutch forces, brothers of William the Silent, were killed: Louis of Nassau (born 1538) and Henry of Nassau-Dillenburg (born 1550). In the Battle of Mookerheyde, Spanish forces defeated Dutch forces composed of German mercenaries on 14 April 1574 during the Eighty Years' War near the village Mook and the river Meuse not far from Nijmegen in Gelderland. They proceeded towards Maastricht to rendezvous with their elder brother William the Silent, Prince of Orange, who led 6000 Dutchmen.