Lee and Marion proceeded next against Fort Watson on the Santee which commanded in a great measure the communication with Charleston. Having neither artillery nor besieging tools they reared a tower above the level of the rampart whence their rifle fire drove the defenders, and themselves then mounted and compelled the garrison to surrender. They could not, however, prevent Colonel Watson from leading 500 men to reinforce Lord Rawdon, who then advanced with the intention of bringing Greene again to action, but found him fallen back upon so strong a position as to afford no reasonable hope of success. His lordship finding his convoys intercepted and viewing the generally insecure state of his posts in the lower country, considered himself under at least the temporary necessity of retreating thither. He had first in view the relief of Mott's House, on the Congaree, but before reaching it had the mortification to find that with the garrison of 165 it had fallen into the hands of Marion and Lee. He continued his march to Monk's Corner, where he covered Charleston and the surrounding country. The partisan chiefs rapidly seized this opportunity of attacking the interior posts and reduced successively Orangeburg and Granby on the Congaree, and early in June, Augusta, the key of upper Georgia, surrendered to Lee and Pickens. In these five forts they made 1,100 prisoners. The most important one, however, was that named Ninety-Six, on the Saluda, defended by a garrison of 500 men. Orders had been sent to them to quit and retire downward but the messenger was intercepted and Colonel Cruger, the commander, made the most active preparations for its defense. Greene considered the place of such importance that he undertook the siege in person with 1,000 regulars. He broke ground before it on the night of the 23d of May (1781), and though much impeded by a successful sally on the following day, proceeded with such energy that by the 3d of June the second parallel was completed and the garrison summoned, but in vain, to surrender. On the 8th, he was reinforced by Lee from the capture of Augusta and though he encountered a most gallant and effective resistance trusted that the place must in due time fall. Three days after, however, he learned that Rawdon, having received a reinforcement from Ireland, was in full march to relieve it and had baffled the attempts of Sumter to impede his progress. The American leader, therefore, feeling himself unable to give battle saw no prospect of carrying the fortress unless by storm. On the 18th (June, 1781), an attack against the two most commanding outworks was led by Lee and Campbell, the former of whom carried his point, but the latter, though he penetrated into the ditch and maintained his party there for three-quarters of an hour, found them exposed to so destructive a fire as compelled a general retreat. [2] The siege was immediately raised and Lord Rawdon, on the 21st, entered the place in triumph. Being again