Denis continued his naval career, commanding the 90-gun in Admiral Edward Hawke's unsuccessful expedition against Rochefort in September 1757. At the action of 29 April 1758, he was captain of the 70-gun which defeated and captured French ship of the line "Raisonnable " in the Bay of Biscay. "Dorsetshire" was with the fleet at the decisive victory of Quiberon Bay in 1759. In 1767 he was created a baronet, of St Mary's in the County of Kent, but as he left no male heir the title became extinct on his death.