Captain Thomas Richards acquired a letter of marque on 25 May 1803, shortly after the resumption of war with France.

The first mention of her in 1803 in Lloyd's List's (LL) ship arrival and departure (SAD) data shows her sailing to the South Seas.

[2] LL reported on 13 December that Rambler, of London had captured a French whaler and sent her into St Helena.

Captain John Marshall sailed Rambler from London on 9 August 1806, bound for the South Seas on her 4th whaling voyage.

[2] On 21 November 1807 Rambler, Marshall, master, was returning to England from the South Seas when a French privateer captured her.