Being well known in Zürich, Grebel left the work to others and set out on an evangelistic mission to the surrounding cities. In February, Grebel baptized Wolfgang Ulimann by immersion in the Rhine River. Ulimann was in St. Gall, and Grebel traveled there in the spring. Conrad Grebel and Wolfgang Ulimann spent several months preaching with much success in the area of St. Gall. In the summer he went to Grüningen and preached with great effect. In October 1525 he was arrested and imprisoned. While in prison, Grebel was able to prepare a defense of the Anabaptist position on baptism. Through the help of some friends, he escaped in March 1526. He continued his ministry and was at some point able to get his pamphlet printed. Grebel removed to the Maienfeld area in the Canton of Grisons (where his oldest sister lived). Shortly after arrival he died, probably around July or August.