A counter-revolt in 1555 failed, and many established families left the city. In search of a common theology Zwingli, who had studied in Basel at the same time as Erasmus, had arrived at a more radical renewal than Luther and his ideas differed from the latter in several points. A reconciliation attempt at the Marburg Colloquy in 1529 failed. Although the two charismatic leaders found a consensus on fourteen points, they kept differing on the last one on the Eucharist: Luther maintained that through sacramental union the bread and wine in the Lord's Supper became truly the flesh and blood of Christ, whereas Zwingli considered the bread and wine only symbols. This schism and the defeat of Zürich in the Second War of Kappel in 1531, where Zwingli was killed on the battlefield, were a serious setback, ultimately limiting Zwinglianism to parts of the Swiss confederacy and preventing its adoption in areas north of the Rhine. After Zwingli's death, Heinrich Bullinger took over his post in Zürich. Reformers in Switzerland continued for the next decades to reform the Church and to improve its acceptance by the common people. Bullinger in particular also tried bridging the differences between Zwinglianism and Calvinism. He was instrumental in establishing the Consensus Tigurinus of 1549 with John Calvin and the Confessio Helvetica posterior of 1566, which finally included all Protestant cantons and associates of the confederacy. The Confessio was also accepted in other European Protestant regions in Bohemia, Hungary, Poland, the Netherlands, and Scotland, and together with the Heidelberg Catechism of 1563, where Bullinger also played an important role, and the Canons of Dordrecht of 1619 it would become the theological foundation of Protestantism of the Calvinist strain. Religious civil war The success of the Reformation in Zürich and its rapid territorial expansion definitely made this religious renewal a political issue and a major source of conflict between the thirteen cantons. The alpine cantons of Uri, Schwyz, Unterwalden, Lucerne, and Zug remained staunchly Catholic. Their opposition was not uniquely a question of faith; economic reasons also played a role. Besides on agriculture, their economy depended to a large degree on the mercenary services and the financial recompensations for the same. They could not afford to lose this source of income, which was a major target of reformatory criticism. In contrast, the cities' economies were more diversified, including strong crafts and guilds as well as a