Apart altogether from the question of religion, there was a natural opposition between populous and manufacturing centres like Berne and Basle, and the rural cantons, devoted almost entirely to agricultural and pastoral pursuits. When religious differences supervened to accentuate the rivalry already in existence, they led almost inevitably to the division of Switzerland into two hostile camps. Zurich, Basle, Berne, Schaffhausen, and St. Gall, though they were the most important cities, soon found themselves unable to force their views on the rest of the country, as they were withstood by the federal council, the majority of which was still Catholic. The latter insisted that a conference should be held to settle the religious disputes. The conference was arranged to take place at Baden in 1526. Eck, assisted by two other Catholic theologians, Faber and Murner, undertook to defend the Catholic position. Zurich refused to send representatives, but the reforming party were represented by Oecolampadius, Haller, and others of their leaders. The conference was attended by delegates from twelve cantons, and was approved of by the Swiss bishops. After a discussion lasting fifteen days during which Eck defended the Catholic doctrine regarding the Mass, Eucharist, Purgatory, and the Intercession of the Saints, the majority of the cantons decided in his favour, and a resolution was passed forbidding religious changes in Switzerland and prohibiting the sale of the works of Luther and Zwingli. It was soon evident, however, that peace could not be secured by such measures. The rural and Catholic cantons were in the majority, much to the disgust of flourishing cities like Berne and Zurich. These states, believing that they were entitled to a controlling voice in the federal council, determined to use the religious question to bring about a complete change in the constitution of the country by assigning the cantonal representation in the federal council on the basis of population. They formed an alliance with the other Protestant cantons and with Constance to forward their claims (1527-8), but the Catholic cantons imitated their example by organising a Catholic federation to which the Archduke, Ferdinand of Austria, promised his support (1529).