In January and February 1689 he voted against the motion to put William of Orange and Mary on the throne and against the motion to declare that James II had abdicated it. Nevertheless, he subsequently joined the forces of William of Orange, by whom he was made colonel of the Queen's Troop of Horse Guards on 20 April 1689. He accompanied William in his Irish campaign, debarking with him in Carrickfergus on 14 June 1690 and commanded this troop at the Battle of the Boyne in July 1690. In February 1691 he became Lord Lieutenant of Somerset.