HMS Amaranthe was an 18-gun Royal Navy Cruizer-class brig-sloop built by John Dudman at Deptford Wharf and launched in 1804.

[3] She served in the Caribbean, taking part in an action and two campaigns that gained those members of her crew that survived until 1847 the NGSM.

After joining a squadron gathered off Barbados for the invasion of Martinique, Amaranthe participated in blockading the French West Indian islands.

For her part Amaranthe lost one man killed and five wounded due to fire from batteries on the shore.

Including the losses in the earlier fighting before Amaranthe arrived, the British had lost some 12 men killed, 31 wounded, and 26 missing (drowned or prisoners) for little gain.

Amaranthe shared with Captain, Pompee, and Morne Fortunee in the prize money pool of £772 3s 3d for the capture of Frederick on 30 December 1808.

During this campaign Pelham served on shore with a detachment of sailors and held the temporary Army rank of lieutenant colonel.

There they were blockaded until 14 April, when a British force under Major-General Frederick Maitland invaded and captured the islands.

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