This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
Reformed Zurich and the Catholic cantons of the Swiss Confederation fought two armed confrontations, in 1529 and 1531, over the Reformation's spread into the Mandated Territories the cantons administered jointly. The First War of Kappel began in June 1529 after Catholic authorities in Schwyz executed the Reformed preacher Jacob Kaiser for heresy; Zurich, having adopted Huldrych Zwingli's Reformation, mobilized its forces in response, but a peace was negotiated at the border village of Kappel am Albis before the two armies engaged.
That negotiated peace produced the Kappeler Milchsuppe, a legend still told in Swiss memory: troops of both sides are said to have shared a pot of milk soup across the border line while the terms of the First Peace of Kappel, signed 25 June 1529, were settled, an agreement that let each canton determine its own religious confession without a battle being fought. The peace held for two years, but Zurich's continuing pressure to spread Reformed worship into the jointly governed territories, the underlying stake in both wars rather than a side effect of either, was not resolved by it.