Battle of Landen
He was promoted captain in The Queen's Regiment of Horse on 13 June 1685, and served with the regiment during the War of the Grand Alliance, becoming noted for courage. On 10 August 1692, he was promoted colonel of the regiment, replacing Sir John Lanier, killed at the Battle of Steenkerque, and again to brigadier-general in 1693. He fought at the Battle of Landen, and helped cover the escape of William III during the retreat there. He was present in at the Siege of Namur (1695), and was promoted major-general on 1 January 1696. Lumley returned to England after the Peace of Ryswick.