HMS Pearl was a fifth-rate, 32-gun British Royal Navy frigate of the Niger-class. Launched at Chatham Dockyard in 1762, she served in British North America until January 1773, when she sailed to England for repairs. Returning to North America in March 1776, to fight in the American Revolutionary War, Pearl escorted the transports which landed troops in Kip's Bay that September. Much of the following year was spent on the Delaware River where she took part in the Battle of Red Bank in October. Towards the end of 1777, Pearl joined Vice-Admiral Richard Howe's fleet in Narragansett Bay and was still there when the French fleet arrived and began an attack on British positions. Both fleets were forced to retire due to bad weather and the action was inconclusive. Pearl was then despatched to keep an eye on the French fleet, which had been driven into Boston.

Rear-Admiral John Leveson-Gower was a Royal Navy officer and politician from the Leveson-Gower family. As a junior officer he saw action at the Battle of Lagos in August 1759 during the Seven Years' War. As captain of HMS Valiant he was present at the Battle of Ushant on 17 July 1778 during the American War of Independence. He went on to be a junior Lord of the Admiralty and then First Naval Lord. He also sat as Member of Parliament for several constituencies.