In April 1689, Pierre Massue, Comte de la Caillemotte, raised a regiment of Huguenot foot, he was the younger brother of Henri de Massue the Marquis de Ruvigny, who fought at Aughrim and Neerwinden. Later Ruvigny was given the title Earl of Galway.
La Caillemotte's memory is chiefly associated with the Battle of the Boyne. In the midst of the river, when he was at the head of his regiment, and in command of the Huguenot brigade of foot, resisting the Irish cavalry, he was shot through the thigh. As he was carried off by four soldiers, he encouraged his men to advance, by calling out cheerfully and undauntedly, " A la gloirc, mcs enfa/is, h la gloire !
The first news that reached his friends in England was, " Monsieur Caillemotte is wounded, but (it is hoped) not mortally." (Letter from the I Ion. Mrs Edward Russell.) On the morning after the Battle, Dumont de Bostaquct had an opportunity to enquire for him at his tent; lie found that he had fallen into a pleasant slumber, and the surgeon spoke hopefully of his case. But too soon the wound proved to be mortal. At his own request he was removed to Dublin; and he died there, aged 37.
He was replaced by his Lieutenant Colonel, Pierre, Marquis de Belcastel another Huguenot refugee and from then on was known as regt Belcastel until it was disbanded in March 1699.