Serving in command of in the West Indies, Fahie subsequently moved into and then , participating in the seizure of the Danish West Indies in 1807 under Sir Alexander Cochrane. For this service he was promoted into the ship of the line and was prominently involved in the invasion of Martinique in January 1809. In the aftermath, Fahie exchanged ships with Commodore George Cockburn, taking over . "Pompee" was subsequently heavily engaged at the action of 14–17 April 1809 with the French ship "D'Hautpoult". Fahie successfully captured his opponent, but was badly wounded in the battle. By January 1810 he had sufficiently recovered to participate in the invasion of Guadeloupe in the captured "D'Haupoult", renamed HMS "Abercrombie".