Simultaneous to this battle of wills in the Sticht, civil war broke out in Holland between the anti-Burgundian "Hook" and the pro-Burgundian "Cod" parties. Archduke Maximilian I of Habsburg, who had married the Burgundian heiress, Mary of Burgundy, shortly after her father's death, faced threats to the Burgundian heritage from all sides and was initially unable to intervene decisively in Holland. The Hook party in Holland was led by Reinier van Broeckhuysen, a nephew of the former Bishop-Elect Gijsbrecht van Brederode. In 1481 Reinier managed to shortly capture Leiden with an army of Hook exiles but was ultimately forced to abandon the city to the more powerful Habsburg forces. He and his army then sought refuge in the Sticht where they stood under the protection of the energetic and ferocious Viscount January of Montfoort, leader of the anti-Burgundian forces in the bishopric. The Viscount, with the support of the Zoudenbalchs and other anti-Burgundian notables, then effectively staged a coup in the city government of Utrecht, ejecting the pro-Burgundian regents from their offices and thus ensuring that the council was fully committed to the Hook cause. War between the Burgundian's Habsburg heirs and the Hooks of Holland and Utrecht became inevitable.