On the 9th of April (1780) Clinton finished his first parallel, forming an oblique line between the two rivers, from 600 to 1,100 yards from the American works, and mounted his guns in battery. He then, jointly with the admiral, summoned Lincoln to surrender the town. Lincoln's answer was modest and firm: "Sixty days," said he, "have passed since it has been known that your intentions against this town were hostile, in which time was afforded to abandon it, but duty and inclination point to the propriety of supporting it to the last extremity." On receiving this answer Clinton immediately opened his batteries, and his fire was soon felt to be superior to that of the besieged. Hitherto the communication with the country north of the Cooper was open and a post was established to prevent the investiture of the town on that side. After the summons, Governor Rutledge, with half of his council, left the town for the purpose of exercising the functions of the executive government in the State, and in the hope of being able to bring a large body of the militia to act on the rear or left flank of the besieging army, but the militia were as little inclined to embody themselves as to enter the town. For the purpose of maintaining the communication with the country north of the Cooper, of checking the British foragers, and of protecting supplies on their way to the town, the American cavalry, under General Huger, had passed the river and taken post at Monk's Corner, thirty miles above Charleston. Posts of militia were established between the Cooper and Santee and at a ferry on the last-named river, where boats were ordered to be collected in order to facilitate the passage of the garrison, if it should be found necessary to evacuate the town. But Clinton defeated all these precautions. For as the possession of the harbor rendered the occupation of the forts to the southward unnecessary, he resolved to call in the troops which had been employed in that quarter, to close the communication of the garrison with the country to the northward, and to complete the investiture of the town. For these purposes, as the fleet was unable to enter the Cooper river, he deemed it necessary to dislodge the American posts and employed Tarleton to beat up the quarters of General Huger's cavalry at Monk's Corner. Conducted during the night by a negro slave through unfrequented paths, Tarleton proceeded toward the American post, and, although General Huger had taken the precaution of placing sentinels a mile in front of his station and of keeping his horses saddled and bridled, yet Tarleton advanced so rapidly that, notwithstanding the alarm was given by the outposts, he began the attack before the Americans could put themselves in a posture of defense, killed or took about thirty of them, and dispersed the rest. General Huger, Colonel Washington, and many others made good their retreat through the woods. Such as escaped concealed themselves for several days in the swamps.