 At the same time, Campbell did what he could to assist the British troops in America by sending them information, re-inforcements and supplies.By lending some of his troops to serve as marines, he materially aided Admiral Rodney in his great victory over François Joseph Paul de Grasse at the Battle of the Saintes, saving Jamaica from a French invasion.Campbell's wife, Amelia, and her sister, only just managed to join him in Jamaica.