Dacres himself entered the navy in 1775 to serve aboard the 50-gun fourth rate under Captain Francis Banks. He was present at the evacuation of Boston, the capture of New York —serving under Sir Peter Parker— the occupation of Aquidneck Island, and in various other services. He remained aboard "Renown" until 1778, when he returned to England and joined the frigate "Apollo", under Captain Philemon Pownall, and was present at the capture of the French frigate on 31 January 1779.