Lord Dillon's brother James commanded the regiment as colonel-proprietor from 1744 to 1745 when he was killed in the Battle of Fontenoy fighting under Maréchal de Saxe for France against the English under the Duke of Cumberland. Thereupon the 4th brother, Edward, succeeded as colonel. He continued to fight with the regiment under de Saxe against the English under Cumberland, but in 1747 he was wounded at the Battle of Lauffeld, taken prisoner, and died.