Schmalkaldic War
The peace finally ended in the Schmalkaldic War (), a brief conflict between 1546 and 1547 between the forces of Charles V and the princes of the Schmalkaldic League. The conflict ended with the advantage of the Catholics, and the Emperor was able to impose the Augsburg Interim, a compromise allowing slightly modified worship, and supposed to remain in force until the conclusion of a General Council of the Church. However various Protestant elements rejected the Interim, and the Second Schmalkaldic War broke out in 1552, which would last until 1555.