 In 1440, Grüningen bailiwick was invaded by the forces of Schwyz and Glarus in the course of the Old Zürich War.A force of 1,000 laid siege to the town and castle, which were defended by Jakob Murer and a garrison of 40 men.The defenders surrendered on 10 November 1440, three weeks before Zürich was forced to sign the unfavourable peace of Lucerne, on 1 December 1440.