Through Buillinger the teachings of the Reformation found their way to Kappel, and so were on 9 March 1525 the images were removed from the church. On 4 September of that same year, the Mass was abolished. A year later, on 29 March 1526, the monks celebrated Communion as Protestants and put off their cowls. Many left the monastery and turned crafts or became preachers. The Convention finally handed over the monastery in 1527 to the City of Zurich. Wolfgang Joner, Heinrich Bullinger and four other men remained in Kappel and operated the school as a boys boarding school. The present church became the parish church of Kappel. During the First War of Kappel, in June 1529, Kappel was the scene of the encounter between Protestant and Catholic troops. The encounter ended peacefully with a negotiation and the legendary "Kappeler Milchsuppe". While the leaders negotiated an end to the conflict, the common soldiers began making a meal. This meal, the "Kappeler Milchsuppe" was a bread and milk soup cooked in a pot placed exactly on the cantonal border between Zurich and Zug. For the soup, the Catholics provided the milk, while the Protestants provided the bread. However, the Second War of Kappel didn't end as well. On 11 October 1531, the Protestant and Catholic armies met again, and the Zurich reformer Huldrych Zwingli was killed.