The Royal Navy purchased the Newcastle collier Ramillies in June 1804 and commissioned her as HMS Proselyte in September 1804, having converted her to a 28-gun sixth rate in July and August.

[2] On 9 January 1805 he sailed her for the West Indies,[3] escorting a convoy of 150 merchant vessels and three regiments of infantry.

[4] Sayer moved to Galatea in July and Captain John Woolcombe took command, sailing her back to Portsmouth in November.

[2] During the Gunboat War on 2 October 1808 the Admiralty published a notice for mariners that it had ordered her to station herself off the island of Anholt in the Kattegat to carry a light for the safety of passing convoys.

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