Milan was a French brig built at Saint Malo, from plans designed by François Pestel that had already served for Curieux in 1800 and for Palinure in 1804.

Lieutenant-Commander Jacques de Saint-Cricq commissioned Milan on 20 January 1808 at Saint Servan.

[5][1] She departed Saint Malo on 6 March 1808 with 67 men of the 86th Line Infantry Regiment, bound for Cayenne.

[5] On 10 September 1808, Milan departed Cayenne, bound for Saint Nazaire, where she arrived on 18 October, before undergoing repairs at Paimboeuf.

[1] On 29 October 1808, Milan, under Lieutenant Nicolas Touffet, departed Mindin with 31 soldiers of the 26th Line Infantry Regiment to be ferried to Gouadeloupe.

[1] However, off Ile de Ré, she encountered the British frigates HMS Surveillante and Seine;[1] trapped in a heavy sea, Touffet struck without a fight.

[7] Achates captured the American brig Mary Ann, Irving, master, from Bayonne, on 29 December 1811.

[b] On 29 January 1813 Achates captured the American ship Orbit, of 390 tons (bm), six guns, and 25 men.

[16] She had been sailing from Bombay to Lisbon via Pernambuco with a valuable cargo when the French privateer Lion captured her.

The vessel was a brig of 140 tons (bm), with a billet head and yellow sides, apparently American-built and about two years old.

[27] Achates returned to Plymouth on 21 September from having sailed to assist the disabled ships of a convoy from Jamaica.

[4] The "Principal Officers and Commissioners of His Majesty's Navy" offered "Achates brig, of 327 tons" for sale at Plymouth on 11 June 1818.