As for what concerns the Castles of Ehrenbreitstein and Homestein, the Emperor shall withdraw, or cause the Garisons to be withdrawn in the time and manner limited hereafter in the Article of Execution, and shall restore those Castles to the Elector of Treves, and to his Metropolitan Chapter, to be in the Protection of the Empire, and the Electorate; for which end the Captain, and the new Garison which shall be put therein by the Elector, shall also take the Oaths of Fidelity to him and his Chapter.