In 1887, Bismarck appealed to the Pope to use his authority to order the Center to support the military proposals of the government. Windthorst took the responsibility of keeping the papal instructions secret from the rest of his party and of disobeying the instructions. In a great meeting at Cologne in March 1887, he defended and justified his action, and claimed for the Center full independence of action in all purely political questions. In the social reform, he supported Bismarck, and as the undisputed leader of the largest party in the Reichstag, he was able to exercise influence over the action of the government after Bismarck's retirement. His relations with the emperor William II became very cordial, and in 1891 he achieved a great parliamentary triumph by defeating the School bill and compelling Gossler to resign.