Knowles, who entered the navy as a captain’s servant, spent much of his naval career in the West Indies, where he married the daughter of a leading Barbados planter. After serving in the expeditions against Portobello and Cartagena, on which he published several pamphlets, he was appointed governor of Louisburg, but soon applied for a transfer to the West Indies, explaining to Anson that he had ‘more the glory of his Majesty’s arms at heart than views after private lucre’.
He died 9 Dec. 1777.
