budding industrial sector. Fribourg and Solothurn also remained Catholic. The five alpine cantons perceived the Reformation as a threat early on; already in 1524 they formed the "League of the Five Cantons" (Bund der fünf Orte) to combat the spreading of the new faith. Both sides tried to strengthen their positions by concluding defensive alliances with third parties: the Protestant cantons formed a city alliance, including the Protestant cities of Konstanz and Strasbourg (Christliches Burgrecht), translated variously as Cristian Civic Union, Christian Co-burghery, Christian Confederation and Christian Federation (in Latin Zwingli called it Civitas Christiana or Christian State); the Catholic ones entered a pact with Ferdinand of Austria. In the tense atmosphere, small incidents could easily escalate. Conflicts arose especially over the situation in the common territories, where the administration changed bi-annually among cantons and thus switched between Catholic and Protestant rules. Several mediation attempts failed such as the disputation of Baden in 1526. After numerous minor incidents and provocations from both sides, a Protestant pastor was burned on the stake in Schwyz in 1529, and in retaliation Zürich declared war. By mediation of the other cantons, open war (known as the First War of Kappel) was barely avoided, but the peace agreement (Erster Landfriede) was not exactly favourable for the Catholic party, who had to dissolve its alliance with the Austrian Habsburgs. The tensions remained essentially unresolved. Two years later, the second war of Kappel broke out. Zürich was taking the refusal of the Catholic cantons to help the Grisons in the Musso war as a pretext, but on 11 October 1531, the Catholic cantons decisively defeated the forces of Zürich in the battle of Kappel am Albis. Zwingli was killed on the battlefield. The Protestant cantons had to agree to a peace treaty, the so-called Zweiter Kappeler Landfriede, which forced the dissolution of the Protestant alliance (Christliches Burgrecht). It gave Catholicism the priority in the common territories, but allowed communes that had already converted to remain Protestant. Only strategically important places such as the Freiamt or those along the route from Schwyz to the Rhine valley at Sargans (and thus to the Alpine passes in the Grisons) were forcibly re-Catholicised. In their own territories, the cantons remained free to implement one or the other religion. The peace thus prescribed the Cuius regio, eius religio-principle that would also be adopted in the peace of Augsburg in the Holy Roman