The Süddeutscher Städtebund (South German City League) formed during the years 1375-78. Most important members were Augsburg, Ulm, Reutlingen, Heilbronn and Strassburg. Various South German princes, led by those of Württemberg and Habsburg, fought them. With the help of the Swiss, the cities stayed victorious, and other than in OTL, their alliance wasn't interdicted by the Roman king. In this war, the Habsburgs lost most of their territories except Freiburg with the Black Forest.