Over the next three years, Campbell participated in the campaigns to capture Martinique, the Îles des Saintes, and Guadeloupe from the French.

He was severely wounded on 25 March 1814 while leading a cavalry charge during the Battle of Fère-Champenoise when a Russian Cossack mistook him for a French officer.

After the abdication of Napoleon in April 1814, Campbell was tasked with escorting him into exile on the Island of Elba and then heading the military detachment there.

Lord Castlereagh, Great Britain's foreign minister, had insisted that Napoleon be given complete freedom on the island.

[2] In a 4th June 1833 letter to his nephew James Fitzjames, the Reverend Robert Coningham writes: "My poor friend Sir Neil Campbell who died at Sierra Leone, lost his life by imprudent exposure & exertion before he had recovered entirely from an attack of fever, by which means a relapse took place, when he was too weak to struggle against the malady.