In early 1793, Thetis captured the East Indiaman Trajan, Captain Joseph Boudel, which was coming from Pondicherry.

[4] On 2 May 1795 Rear Admiral George Murray sent Captain Alexander Cochrane in Thetis, together with HMS Hussar, to intercept three French supply ships reported at Hampton Roads.

They had sailed to American ports to gather provisions and naval stores to bring back to France.

Cochrane had intended to leave the prizes in charge of the cutter Prince Edward after repairing the damage to his vessel during the night.

They pressed many men on board, narrowly exempting the Irish revolutionary Wolfe Tone, who was going to Philadelphia.

Because Thetis served in the navy's Egyptian campaign (8 March to 2 September 1801), her officers and crew qualified for the clasp "Egypt" to the Naval General Service Medal that the Admiralty authorised in 1850 to all surviving claimants.

[c] In 1847 the Admiralty awarded the Naval General Service Medal with clasp "Guadaloupe" to all surviving participants of the campaign.