Dacres was born in
Gibraltar in February 1749, the eldest son of the secretary of the garrison Richard Dacres, and his wife Mary Dacres, née Bateman. He had a younger brother,
Richard Dacres, who also embarked on a naval career. James Richard entered the navy in February 1762, joining the 28-gun
frigate , which was then under the command of Captain
Herbert Sawyer. Shortly afterwards, on 21 May that year, the
Active in company with captured the Spanish register ship
Hermione. The
Hermione had been bound from
Lima carrying a cargo of gold coin, gold, silver and tin ingots, and cocoa and when captured became the richest prize taken during the war. The
Actives share of the prize money came to £251,020 12s, which meant that even an ordinary seaman received the sum of £485 3s 4d. Dacres moved aboard Captain
William Hotham's 32-gun , following this with service aboard Captain
John Elliot's and Commodore
Richard Spry's 60-gun . Spry appointed Dacres as lieutenant to the 32-gun under Captain
Phillips Cosby on 17 March 1769. ==American War of Independence==