After the Peace of Münster was signed, Bicker was of the opinion that it was no longer necessary to maintain a standing army, bringing him into vehement conflict with prince Willem II, who had succeeded his father Frederick Henry as stadtholder. To regain power William went on the march towards Dordrecht and Amsterdam with an army. His troops got lost in a dense fog and were discovered by the postal courier on Hamburg, who also warned Andries' son Gerard, the high bailiff of Muiden, to leave without delay for Amsterdam. The mayors of Amsterdam had the civic guard called out, the bridges raised, the gates closed and the artillery dragged into position. Andries Bicker was purged from the vroedschap, as was his brother Cornelis, as one of the conditions of the treaty that followed, led by Joan Huydecoper van Maarsseveen. Henceforth, it was the equally republican-minded brothers Cornelis and Andries de Graeff, and their following, who dominated Amsterdam. His niece Wendela Bicker married the powerful raadspensionaris Johan de Witt.