Catholic. Anthony, his eldest brother James, his sister Elizabeth, and his younger brother George became courtiers in the inner circle at Whitehall. The King arranged a Protestant marriage for James in 1691. In January 1663 Anthony met at Whitehall Philibert, chevalier de Gramont, a French exile. Gramont was already in his forties and a younger half-brother of the duc de Gramont, Marshal of France. He had got into trouble by courting Mademoiselle Anne-Lucie de la Mothe-Houdancourt, on whom Louis XIV had set his eyes. Hamilton befriended Gramont, who quickly became part of the court's inner circle. Gramont courted Anthony's sister Elizabeth, "La belle Hamilton", who was seduced by Gramont's verbiage and gallantry. He married her in London in December 1663 or early in 1664. On 7 September, the couple had a son who died as an infant. In March 1664, Louis XIV, having heard of Gramont's marriage, allowed him to return. Second French exile In 1667, Anthony's brother George refused to take the oath of supremacy and went to France. George recruited a regiment in Ireland for French service and fought in the Franco-Dutch War (1672–1678). Anthony followed George to France in 1667 and took service in that regiment. Some time later they were joined by Anthony's younger brother Richard. Anthony probably fought together with George under Turenne in the Battle of Sinsheim in June 1674, and did quite surely so at Entzheim in October against Imperial troops under the Duke von Bournonville as he and George were both wounded at that battle. George's and Anthony's wounds and the voyage to England, described below, caused them to miss Turenne's winter campaign 1674/1675, during which the French marched south and surprised the Imperialists by attacking upper Alsace, winning the Battle of Turckheim on 5 January 1675. George returned to France from England, but Anthony and Richard continued to Ireland to recruit for the regiment. The recruits were picked up by French ships at Kinsale in April after a missed appointment at Dingle in March. On 27 July 1675 Anthony probably fought together with George at Sasbach, where Turenne was killed. Two of Turenne's general officers considered themselves second in command: Count Guy Aldonce de Durfort de Lorges and the marquis de Vaubrun. At the retreat from Sasbach and the Battle of Altenheim in August the French army was therefore commanded by both until Vaubrun was killed in that battle on 1