On 2 September, while on patrol in the company of Zealous, Goliath, Swiftsure, Emerald, Alcmene, and Bonne Citoyenne, Seahorse assisted in the destruction of Anemone, a French aviso.

[9] Emerald and Seahorse chased Anemone inshore where she anchored in the shallow water, out of reach of the two British frigates.

While the Frenchmen were attempting to escape along the coast, unfriendly Arabs captured them and stripped them of their clothes, shooting those who resisted.

The commander and seven others escaped naked to the beach where the British, who had swum ashore with lines and wooden casks, rescued them.

[9][b] Seahorse arrived at Portsmouth in October 1799, and returned to the Mediterranean in May 1800 as the flagship of Rear-admiral Sir Richard Bickerton.

[4] On the way, in the evening of 4 April, she encountered the merchantman Washington which was sailing form Lisbon to Philadelphia, and which cleared for action.

The convoy consisted of the East Indiamen Northampton, Manship, Sarah Christiana, Comet, General Stuart, Sovereign, Caledonia, Ann, Princess Mary, Varuna, Carron, Elizabeth, Monarch, and Friendship.

[14] In 1847 the British Admiralty authorized the issue of the NGSM with clasp "Seahorse with Badere Zaffere" to all the surviving claimants from the action.

(John Robyns, Captain of the Royal Marine detachment of HMS Albion, reckoned Seahorse took £100,000 in prizes.

In November, Seahorse was at Pensacola until the arrival of General Andrew Jackson's forces caused the British to depart.

Whilst accompanied by Alceste and Sophie passing Lake Borgne in the direction of the Chandeleur Islands, They were fired upon by two gunboats of the US Navy.

[21] Her officers and crew qualified for the clasps to the Naval General Service Medal that the Admiralty issued in 1847 to all surviving claimants, for the former and latter actions of 17 August 1814 and 14 December 1814 respectively.