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1318
Siege of Solothurn by the House of Habsburg

From Wikipedia:

In the Middle Ages the settlement grew around the remains of the Roman fortress and the religious house of St. Ursen, dedicated to Ursus of Solothurn, founded in the 8th century. In 1127, it was acquired by the dukes of Zähringen, and became a free imperial city in 1218 when that dynasty extinguished. After the alliance with Berne in 1295, it became part of the Swiss Confederation. In 1382 the Habsburgs attacked the city, involving Solothurn in the Battle of Sempach. By the treaty of two years later, the Habsburgs renounced all claims to the territory of the city. The latter was expanded by acquisition of neighbouring lands in the 15th century, roughly up to the today's canton area.