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The 'Old Zürich War' ('Alter Zürichkrieg'), 1440–1446, was a conflict between the canton of Zürich and the other seven cantons of the Old Swiss Confederacy over the succession to the Count of Toggenburg.
In 1436, Count Friedrich VII of Toggenburg died, leaving neither heir nor will. The canton of Zürich, led by burgomaster Rudolf Stüssi, claimed the Toggenburg lands; the cantons of Schwyz and Glarus made counter-claims, backed by the other cantons. In 1438 Zürich occupied the disputed area and cut off grain supplies to Schwyz and Glarus. In 1440, the other cantons expelled Zürich from the confederation and declared war. Zürich retaliated by making an alliance with Frederick III, Holy Roman Emperor of the house of Habsburg.
The forces of Zürich were defeated in the Battle of St. Jakob an der Sihl on 22 July 1443 and Zürich was besieged. Frederick appealed to Charles VII of France to attack the confederates and the latter sent a force of about 30,000 Armagnac mercenaries under the command of the Dauphin via Basel to relieve the city. In the Battle of St. Jakob an der Birs near Basel on 26 August 1444 a blocking force of roughly 1,600 Swiss confederates were wiped out, but inflicted so heavy losses on the French (8,000 killed) that the Dauphin decided to retreat.
In May, 1444, the confederacy laid siege to Greifensee, and captured the town after four weeks, on May 27, beheading all but two of the 64 defenders on the next day, including their leader, Wildhans von Breitenlandenberg. Even in times of war, the mass execution was widely considered a cruel and unjust deed.
By 1446, both sides were exhausted, and a preliminary peace was concluded. The confederation had not managed to conquer any of the cities of Zürich except Greifensee; Rapperswil and Zürich itself withstood the attacks. In 1450, the parties made a definitive peace and Zürich was admitted into the confederation again, but had to dissolve its alliance with the Habsburgs.
The significance of the war is that it showed that the confederation had grown into a political alliance so close that it no longer tolerated separatist tendencies of a single member.

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