When he was 11 years old his father sent Thomas to sea on HMS Cambridge under Sir Peircy Brett, who was a close friend of the Rev.
Thomas's naval career was short lived; in February 1758 he enrolled as a cadet at the Royal Military Academy, Woolwich.
He commanded a bomb ketch at the bombardment of Le Havre and joined Admiral Edward Hawke's fleet at Quiberon.
He was brigade-major to Brigadier William Phillips and was wounded in the head at the Battle of Saratoga.
He began by condemning 496 new artillery pieces, about a quarter of Britain's annual production, as unsuitable before they were sent to the army or the fleet.
During December 1813 and January 1814, Cyndus and Eurotas actually temporarily exchanged six 24-pounders, presumably to enable both vessels to test the designs against each other.