On the other hand, the struggle between Protestant factions injured the advancement of their mutual interests, and Bucer, encouraged by Philip, was accordingly occupied in the attempt to bring Protestants together on a common religious platform, the result being the Wittenberg Concord. The emperor's fears as to the political purpose of the league were, for the time being, set aside, but at the same time a council which would include representatives of the pope was rejected and measures were taken to secure the permanence of the Protestant cause in the future. In 1538–39 relations between Roman Catholics and Protestants became strained almost to the breaking-point, and war was averted only by the Frankfort Respite. The Protestants, however, failed to avail themselves of their opportunities, largely through the extreme docility and pliability of Philip.