Henry revolted and in September formed an alliance with several German bishops and Swabian nobles. However, further negotiations with King Louis IX of France and the Lombard League failed. The princes adopted a wait-and-see stance, while Henry's forces were stuck in fights with the Lords of Hohenlohe, Margrave Herman V of Baden, and the City of Worms. Emperor Frederick, once he had entered Germany, soon gained a large following. When both sides met in Swabia, Henry was forced to submit to his father on 2 July 1235 at Wimpfen Castle, forsaken by most of his followers. Frederick II and the princes tried Henry on 4 July 1235 in Worms and dethroned him. His sons were deprived of the succession jointly with him. Henry's younger brother Conrad was appointed Duke of Swabia instead and also elected King of the Romans.