Admiral Thomas Mackenzie (1753 – 20 September 1813) was a prominent British Royal Navy officer of the late eighteenth century. Mackenzie's career, while successful, was blighted by a series of controversies that limited his opportunities and command, resulting in his placement in reserve for the last 19 years of his career. During his early service, Mackenzie served at a number of engagements in the American Revolutionary War and advanced rapidly, but he was caught during service in the Indian Ocean in the midst of a disagreement between two senior officers and as a result was placed in reserve at the end of the war. At the start of the French Revolutionary Wars ten years later Mackenzie was restored to service, and commanded the ship of the line at the Glorious First of June. Mackenzie was again involved in a major dispute in the aftermath of the battle over credit for the victory, with the result that he never again served at sea. Life Thomas Mackenzie was born in 1753, the son of Vice-Admiral George Mackenzie. At a young age, Thomas joined the frigate and in 1771 passed the lieutenants exam and joined the sloop . He continued to rise in rank, and in 1776 at the start of the American Revolutionary War he was promoted to post captain for his services at the Battle of Quebec, and was assigned command of the 28-gun frigate . On 4 December he was in command of Lizard when she captured the American privateer Putnam. Mackenzie was later assigned to command the ship , but was captured with his vessel by the French frigate Amazone on 10 September 1779 near Charleston, South Carolina. Released in Cadiz the following year, Mackenzie returned to Britain, was cleared at a court martial and given command of the frigate . Active was attached to the squadron under Commodore George Johnstone sent to the Cape of Good Hope in 1781, but the force was intercepted at Porto Praya on St Jago by a French squadron. The ensuing Battle of Porto Praya was inconclusive, but the French were able to reinforce the Cape before the British could attack, making an invasion impossible. Continuing westwards, Active joined a squadron under Vice-Admiral Edward Hughes and was engaged in operations on the Malabar coast and against the Dutch city of Negapatam. In 1782 he was ordered by the council at Calcutta to escort