His own force was sadly depleted, but he knew that Arnold in Virginia was being heavily reinforced from New York. The only safe course seemed to march northward and join in the operations in Virginia; then afterwards to return southward. This course Cornwallis pursued, arriving at Petersburg and taking command of the troops there on the 20th of May. [Sidenote: Greene takes Camden, May 10, 1781.] [Sidenote: Battle of Eutaw Springs, Sept. 8, 1781.] Meanwhile Greene, after pursuing Cornwallis for about fifty miles from Guilford, faced about and marched with all speed upon Camden, a hundred and sixty miles distant. Whatever his adversary might do, he was now going to seize the great prize of the campaign, and break the enemy's hold upon South Carolina. Lord Rawdon held Camden. Greene stopped at Hobkirk's Hill, two miles to the north, and sent Marion and Lee to take Fort Watson, and thus cut the enemy's communications with the coast. On April 23 Fort Watson surrendered; on the 25th Rawdon defeated Greene at Hobkirk's Hill, but as his communications were cut, the victory did him no good. He was obliged to retreat toward the coast, and Greene took Camden on the 10th of May. Having thus obtained the commanding point, Greene went on until he had reduced every one of the inland posts. At last on the 8th of September he fought an obstinate battle at Eutaw Springs, in which both sides claimed the victory. The facts were that he drove the British from their first position, but they rallied upon a second position from which he failed to drive them. Here, however, as always after one of Greene's battles, it was the enemy who retreated and he who pursued. His strategy never failed. After Eutaw Springs the British remained shut up in Charleston under cover of their ships, and the American government was reëstablished over South Carolina. Among all the campaigns in history that have been conducted with small armies, there have been few, if any, more brilliant than Greene's. [Sidenote: Lafayette and Cornwallis in Virginia, May-Sept., 1781.]