HMS Ethalion was a Royal Navy 36-gun frigate, launched in 1802 at Woolwich Dockyard. She was eventually broken up in 1877.

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Plan of HMS Ethalion
History
United Kingdom
Name	Ethalion
Builder	Woolwich Dockyard
Launched	29 July 1802[1]
Commissioned	1803
Decommissioned	1816
In service	As hospital ship, 1823 As breakwater, 1860s
Fate	Broken up, 1877
General characteristics
Type	Fifth-rate frigate
Tons burthen	996 tons bm[1]
Armament	36 guns

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Ethalion entered service in 1803 under Captain Charles Stuart, operating in the North Sea. In May 1804 she captured the 16-gun Dutch brig Union off Bergen. In 1807, command passed to William Charles Fahie, who took Ethalion to the West Indies.

In December 1807 Ethalion was part of the squadron under Admiral Sir Alexander Cochrane that captured the Danish islands of St Thomas on 22 December and Santa Cruz on 25 December. The Danes did not resist and the invasion was bloodless.^{[2] [Note 1]}

On 26 October 1808 Ethalion captured Washington.^{[Note 2]}

Ethalion also participated in the invasion of Martinique in 1809 under Captain Thomas John Cochrane.

In April 1809, a strong French squadron arrived at the Îles des Saintes, south of Guadeloupe. There they were blockaded until 14 April, when a British force under Major-General Frederick Maitland and Captain Philip Beaver in Acasta, invaded and captured the islands.^[5] Ethalion played a distant part in the Action of 14–17 April 1809.

Even so, she was among the naval vessels that shared in the proceeds of the capture of the islands.^{[Note 3]}

In 1810, Ethalion briefly paid off, before returning to service in 1811 off Lisbon under Captain Heywood and then in the Baltic Sea. On 12 April 1812, Ethalion and Clio captured the Opsloe.^[7]

Shortly after the outbreak of the War of 1812, on 12 August, Ethalion shared in the seizure of several American vessels: Cuba, Caliban, Edward, Galen, Halcyon, and Cygnet.^{[Note 4]}

Ethalion escorted a convoy from the St Lawrence River on 12 November 1813, but bad weather dispersed the vessels. She recaptured the Pomona (or Pomone), of Teignmouth, on 14 December off the coast of Ireland. Pomona had been a prize to the American privateer Prince de Neufchatel.^{[9][Note 5]}

In 1814 Ethalion was operating under Captain William Hugh Dobbie off the Irish Coast and in 1816 was placed in reserve at Woolwich.

In 1823 Ethalion was converted to a hospital ship, which she remained as until becoming a breakwater in the 1860s. She was eventually broken up in 1877.