 Complete the following phrase:  Orange went into exile in his ancestral castle in Dillenburg, which became the center for plans to invade the Netherlands. Louis of Nassau, Oranges brother, crossed into Groningen from East Friesland with a mercenary army of Landsknechten, and defeated a small royalist force at Heiligerlee on 23 May 1568. Two months later, Louis mercenary forces were smashed at the 