On the 27th of July (1780) he put his army in motion and soon experienced the difficulties and privations which De Kalb had been desirous to avoid. The army was obliged to subsist chiefly on poor cattle, accidentally found in the woods, and the supply of all kinds of food was very limited. Meal and corn were so scarce that the men were compelled to use unripe corn and peaches instead of bread. That insufficient diet, together with the intense heat and unhealthy climate, engendered disease, and threatened the destruction of the army. Gates at length emerged from the inhospitable region of pine-barrens, sand hills, and swamps, and, after having effected a junction with General Caswell, at the head of the militia of North Carolina, and a small body of troops under Lieutenant-Colonel Porterfield, he arrived at Clermont, or Rugely's Mills, on the 13th of August (1780), and next day was joined by the militia of Virginia, amounting to 700 men, under General Stevens. On the day after Gates arrived at Rugley's Mills, he received an express from Sumter, stating that a number of the militia of South Carolina had joined him on the west side of the Wateree, and that an escort of clothes, ammunition, and other stores for the garrison at Camden was on its way from Ninety-Six and must pass the Wateree at a ford covered by a small fort nor far from Camden. Gates immediately detached 100 regular infantry and 300 militia of North Carolina to reinforce Sumter, whom he ordered to reduce the fort and intercept the convoy. Meanwhile he advanced nearer Camden, with the intention of taking a position about seven miles from that place. For that purpose he put his army in motion at 10 in the evening of the 15th of August, having sent his sick, heavy baggage, and military stores not immediately wanted, under a guard to Waxhaws. On the march Colonel Armand's [5] legion composed the van; Porterfield's light infantry, reinforced by a company of picked men from Stevens' brigade, marching in Indian files, two hundred yards from the road, covered the right flank of the legion, while Major Armstrong's light infantry of North Carolina militia, reinforced in like manner by General Caswell, in the same order, covered the left. The Maryland division, followed by the North Carolina and Virginia militia, with the artillery, composed the main body and rear guard; and the volunteer cavalry were equally distributed on the flanks of the baggage. The American army did not exceed 4,000 men, only about 900 of whom were regular troops, and 70 cavalry. On the advance of Gates into South Carolina, Lord Rawdon had called in his outposts, and concentrated his force at Camden. Informed of the appearance of the American army, and of the general defection of the country between the Pedee and the Black river, Cornwallis quitted Charleston and repaired to Camden, where he arrived on the same day that Gates reached Clermont.