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 Jan 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.