His Majesty's hired armed ship Charles served the Royal Navy from 17 May 1804 to 13 May 1814. She had a burthen of 309 tons (bm), and an armament of fourteen 18-pounder carronades. Prize money notices and other accounts referred to her interchangeably as the "hired armed brig", "hired armed ship", and "hired sloop".
The Lady's Adventure, Darby, master, arrived at Elsinore on 10 June 1806, having received assistance from Charles. Lady's Adventure had lost her rudder on "Trindall Rock" while sailing from Newcastle to Copenhagen.
In about March 1807 Charles came under the command of G. Davies Robert Clephane on the North Sea station. Between 12 April and 22 May she assisted at the siege of Danzig, together with the hired armed sloop Sally, and HMS Falcon. Charles proved herself useful during the siege and when the British squadron left, evacuated some of General Nikolay Kamensky's troops. On 19 August Charles detained the Flensburg and sent her into Grimsby. The Flensburg, of Copenhagen, was coming from Messina. In October, by one report, Clephane transferred to HMS Nautilus, but this is not borne out by Nautilus's history.
On 17 January 1808 the "armed brig" Charles arrived at Grimsby much damaged and having lost her masts. She had captured a lugger privateer off the Dogger Bank and sent her into Yarmouth. In March 1808 Clephane assumed command of HMS Acorn.
From April 1808, Charles's commander reportedly was James Welsh. However, in June Charles brought into the Humber two Danish schooners laden with grain, the Hercules and the Saint Peter. The prize money announcement reports the capture occurred on 3 June, and that commander of the "hired armed brig Charles" was Lieutenant R. Hexter.
On 1 August "His Majesty's Hired Armed Ship Charles", R.H. Hexter, "late commander", captured the Vrow Christine.
Then on 13 May 1809, the "hired armed ship Charles", under the command of R.H. Hexter, in company with HMS Talbot, captured the Dredokken.
On 23 October Captain Thomas Byam Martin, of Implacable, and chief of the Gottenberg station, sent Hexter and Charles to St Kalf Sound, which is a few miles north of Wingo Sound, Sweden. There she was to protect the vessels of a convoy that a storm had scattered, and send them to Flemish Roads, before bringing the rest of the convoy as soon as possible.
On 14 November, three Danish sloops arrived at Leith, prizes to Talbot, the sloop Charles, and the cutter Hero.
On 4 September 1810 she brought into Grimsby two vessels that she had detained, the Jonge Johanes and the Neptunus, which was carrying a cargo of fish.
In 1811, Lieutenant Lawrence Smith commanded. In February gales caused the ship Americano, from "the Brazils", to run afoul of Charles, resulting in extensive damage to Americano.
Smith was followed in 1812 by Lieutenant J. Mitchell. On 1 August Charles detained and sent into Dover the Mars, of and for Wilmington. Mars had been sailing from London. British authorities released Mars a few days later.
On 20 July 1813 she captured the American ship Eliza Wheeler. Eliza, Wheeler, master, was carrying a cargo of silks to New York. She arrived at Leith on 22 July.
On 18 August Charles captured the Emanuel, Humanus Von Leick, master.
The French privateer captured the Nancy, Morrison, master, off Beachy Head on 8 October as Nancy was sailing from London to Madeira. Charles recaptured Nancy and brought her into Dover; unfortunately, the master had been killed.
Then in 1814 Lieutenant J. Little commanded Charles.