Having attained the rank of Major in the 60th regiment in 1759, he had the honor of serving under General Wolfe, and received a severe wound in the head, whilst gallantly forcing a landing, twenty miles above Quebec, under the immediate command of General Carleton, afterwards Lord Dorchester. Upon the reduction of Canada, Major Prevost was promoted to the rank of Lieutenant-Colonel, and served with reputation at the capture of Martinique and the Havannah. In 1775, he was appointed to the command in East Florida, and, in 1778, he eminently distinguished himself by his defence of Savannah, against the attack of a very superior force of French and Americans, under the Comte d'Estaing and General Lincoln. The garrison consisted of only 2,300 men, while the force of the besiegers amounted to 8,000, supported by a fleet of twenty-two sail of the line. Such, however, was the determined energy of Major-General Prevost, and of the British soldiers and sailors under his command, that the enemy were compelled to abandon the enterprize, after thirty-three days' close siege.[2] In 1780, Major-General Prevost, after having served twenty-two years in North America and the West Indies, returned to England, to enjoy the pleasing consciousness of having always discharged his duty with zeal and effect. His health was much impaired by a long residence in climates unfavorable to an European constitution, and, on the 6th May, 1786, he died, at Greenhill Grove, near Barnet, in the sixty-third year of his age.