In 1527, Bucer and Capito attended a disputation in Bern to decide whether the city should accept reformed doctrines and practices. Bucer provided strong support for Zwingli's leading role in the disputation, which finally brought the Reformation to Bern. The last meeting between Zwingli and Luther was at the Marburg Colloquy of October 1529, organised by Philip of Hesse and attended by various leading reformers, including Bucer. Luther and Zwingli agreed on 13 of the 14 topics discussed, but Zwingli did not accept the doctrine of the real presence, on which Luther would not compromise. After the discussion broke down between the two, Bucer tried to salvage the situation, but Luther noted, "It is obvious that we do not have one and the same spirit." The meeting ended in failure. The following year, Bucer wrote of his disappointment at doctrinal inflexibility:  The extent of the theological division among the reformers became evident when the Holy Roman Emperor Charles V asked them to present their views to him in 1530 at the Diet of Augsburg. Philipp Melanchthon, the main delegate from Wittenberg, quickly prepared the draft that eventually became the Augsburg Confession. The Wittenberg theologians rejected attempts by Strasbourg to adopt it without the article on the Lord's Supper. In response, Bucer wrote a new confession, the "Confessio Tetrapolitana" (Tetrapolitan Confession), so named because only four cities adopted it, Strasbourg and three other southern German cities, Konstanz, Memmingen, and Lindau. A copy of Melanchthon's draft was used as the starting point and the only major change was the wording on the article on the eucharist. According to Eells, the article on the eucharist in the Tetrapolitan Confession stated, "In this sacrament his true body and true blood are truly given to eat and drink, as food for their souls, and to eternal life, that they may remain in him and he in them". The ambiguous word "truly" was not defined. Charles, however, decreed on 22 September that all reformers must reconcile with the Catholic faith, or he would use military force to suppress them. This prompted Melanchthon to call a meeting with Bucer and after lengthy discussions they agreed on nine theses, which they sent to Luther and to Strasbourg. The Strasbourg magistrates forwarded them to Basel and Zürich.