In the celebrated retreat through the Jerseys, Captain Doyle acted as Major of Brigade. During the winter of 1779 his regiment was ordered to South Carolina, under the command of Lord Rawdon, where he assisted at the siege of Charleston. After the fall of this place in May 1780, Captain Doyle accompanied Lieut.-General the Earl Cornwallis up the country, by whom he was appointed Major of Brigade, and was honorably mentioned in his Lordship’s despatch relative to the action at Camden, which was fought on the 16th of August 1780. Upon Lord Cornwallis quitting the province of South Carolina, Captain Doyle served in the same capacity to Colonel Lord Rawdon, who succeeded to the command of this portion of the troops, and soon had another opportunity of distinguishing himself. General Green, having contrived after the battle of Guildford, on the 15th of March 1781, to turn Lord Cornwallis’s left, by a rapid movement penetrated the upper parts of South Carolina, and presented himself before the village of Camden, where Lord Rawdon commanded a small detachment, not exceeding nine hundred men, while the enemy’s force consisted of three thousand regulars, a fine corps of cavalry, and a numerous body of militia, strongly posted on the heights above the village in which the British were quartered. His Lordship seeing the difficulty of a retreat, boldly determined to advance against the enemy. Accordingly on the 25th of April 1781, he chose the hour of mid-day to make his attempt, when least expected, his march being concealed by a circuitous route through thick woods. This sudden and rapid manœuvre enabled his Lordship to reach Hobkirk Hill before General Green became aware of the movement, and the British gained a complete victory. The exertions of Brigade-Major Doyle on this well-fought field were alluded to in highly honorable terms in his Lordship’s despatch. Having raised the siege of Ninety-six, Lord Rawdon returned to England on account of ill health, when the Brigade-Major prepared to join the Earl Cornwallis in Virginia; but in consequence of the effects of the action at Ewtaw Springs on the 8th of September 1781, he was requested, from his knowledge of the country, to remain in the province to fill a more prominent situation. He subsequently acted as Adjutant-General and Public Secretary to Colonel Paston Gould; and on that officer’s decease in the following year, he was honored with the same confidence by his successors, Major-General James Stuart and Lieut.-General the Honorable Alexander Leslie.