The first, known also as the Second Confession of Basel, was drawn up at that city in 1536 by Bullinger and Leo Jud of Zurich, Megander of Bern,Oswald Myconius and Grynaeus of Basel, Bucer and Capito of Strassburg, with other representatives from Schaffhausen, St Gall, Muhlhausen and Biel.
True, the impression conveyed by the attitude of the Catholic party at the second Diet of Spires had served to awaken the feeling for solidarity among the Evangelicals there assembled; and on the 22nd of April they had even secured the basis for a provisional alliance in the shape of a formula drawn up by Bucer and dealing with the Lord's Supper.
Here he met his subsequent antagonists, Bucer and Frecht, with whom he seems to have attended the Augsburg conference (October 1518) at which Luther declared himself a true son of the Church.
Menno was not satisfied with the inconsistent answers which he got from Luther, Bucer and Bullinger; he resolved to rely on Scripture alone, and from this time describes his preaching as evangelical, not sacramental.
In 1533, in an important synod, he defended against Martin Bucer the principles of religious freedom as well as his own doctrine and life.
He left Quintana, visited Lyons and Geneva, repaired to Oecolampadius at Basel, and pushed on to Bucer and Capito at Strassburg.
He thought of going to Wittenberg, but his first halt was at Strassburg, where Bucer and Capito received him kindly.
Supported by the estates of the electorate, and relying upon the recess of the diet of Regensburg in 1541, he encouraged Bucer to press on with the work of reform, and in 1543 invited Melanchthon to his.