She was commissioned in May 1778 under the command of Captain Thomas Gaborian. She initially operated as part of the squadron off
the Downs. There she captured the French privateer
Agneau on 15 August.
Amphitrite shared with the sloop , and the cutters , , , and , in the capture on 24 May of the French privateers
Dunkerque and
Prince de Robcq, which had "eight ransomers" aboard. Then on 6 July
Amphitrite and the cutter captured the shallop
Samuel and Elizabeth. In 1780
Amphitrite passed under the command of Captain Robert Biggs. She was among the vessels sharing in the proceeds of the capture in January 1780 of the brig
Kitty and the ship
Jolly Tar. Biggs sailed
Amphitrite to North America in May that year. On her arrival she joined
Graves's squadron. In June 1781 Admiral
Mariot Arbuthnot sent
Amphitrite and several other vessels to attempt to intercept some French reinforcements from entering Boston. On 30 June
Amphitrite captured the brig
Adventure. The Royal Navy took her into service as the
sixth rate , but then sold her in 1783, after the end of the war. On 10 September Admiral Graves received two letters from Biggs dated 10 September, at Boston. Biggs mentioned that together with the armed ship
General Monk,
Amphitrite had captured four prizes. Then on 4 September she had encountered a French ship of the line and a frigate off
Cape Ann, but had escaped them. Lastly, Biggs reported that on 2 September had captured the on 2 September off
Cape Ann. Biggs reported that the French lost 60 men killed and 40 wounded; the British lost one man killed and one man wounded. Between 20 August and 31 October
Amphitrite made a number of captures: •
Experiment, privateer of 300 tons, 20 men and 22 guns; •
Endeavour, of 70 tons, eight men, carrying beef, port, etc.; •
Union, of 100 tons, nine men, carrying beef, port, etc.; •
St. John, of 90 90 tons, 10 men, carrying plank; •
Minerva, of 95 tons, 10 men, carrying tobacco; •
Dolphin of 100 tons, 11 men, carrying plank; •
Nero, carrying tobacco; and lastly, •
Revenge privateer, of 40 tons, 30 men, and eight guns.
Amphitrite may have come under the command of Captain Robert George temporarily in November 1781. Between 11 November and 23 March 1782,
Amphitrite took three vessels: the schooner
Betsey (12 January), and the brigs
Sally (13 February) and
Peggy (20 February).
Amphitrite and then took the privateer
Franklin on 3 April off the Chesapeake. She was in ballast. Five days later the same two captured the brig
Gale, off
Cape Henry. She was taking coffee to Amsterdam. Then on the 14th, they took the brig
Patty, also off Cape Henry. She was carrying flour to Havana. That same day they took the brig
Nymphe, also off Cape Henry, and also carrying flour to Havana. On 2 May
Amphitrite and
Amphion were off Match Springs when they captured three vessels on their way to Philadelphia.
Fair American and the brig
Adriana were carrying rum and dry goods. The sloop
Alpin was carrying sugar and coffee. , a sloop of 10 guns, was the Massachusetts privateer
Amsterdam, which
Amphitrite captured on 19 October. The British took
Observer into the Royal Navy and sold her on 21 October 1784. On 12 November,
Amphitrite captured the brig
Adventure, the schooner
Salisbury, the ship
Rattlesnake, and the sloop
Phoenix. On 5 December she captured the ship
Bellisarius, brig
Marianne, and schooner
Neptune.
Amphitrite continued to take prizes in 1782: •
Betsey (4 March); •
Peggy 22 April; •
Nymphe (5 October); •
Franklin (25 June); • ship
Enterprise recaptured (3 September); and lastly, •
Vigilante (20 December).
Amphitrite, , , and captured the sloop
Lark.
Amphitrite alone captured the ship
Salem Packet, the brigs
Amsterdam,
Dolphin, and
Minerva, and the sloops
Dove and
Fox. American records show that in late January 1783,
Amphitrite, Captain
Robert George, captured the former Massachusetts privateer and now
letter of marque Apollo. She sent
Apollo into New York where she was condemned and sold in March. ==Between the wars==