The situation of Lord Cornwallis had now become desperate. He "dared not show a gun to the old batteries" of the allies, and their new ones, then about to open fire, threatened to render his position untenable in a few hours. "Experience has shown," he then wrote, "that our fresh earthen works do not resist their powerful artillery, so that we shall soon be exposed to an assault in ruined works, in a bad position, and with weakened numbers." To retard as much as possible what now appeared to be inevitable, at an early hour next morning (October 16th) the garrison made a sortie; when three hundred fifty men, led by Lieutenant-Colonel Abercrombie, attacked two batteries within the second parallel, carried them with inconsiderable loss, and spiked the guns; but the guards and pickets speedily assembled, and drove the assailants back into the town before any other damage was done. About 4 P.M. of the 16th the fire of several batteries in the second parallel were opened on the town, while the entire line was rapidly approaching completion. At this time the situation of the enemy was peculiarly distressing; his defences being in ruins, his guns dismounted, and his ammunition nearly exhausted while an irresistible force was rapidly concentrating its powers to overwhelm and destroy him. At this time Lord Cornwallis entertained the bold and novel design of abandoning his sick and baggage, and by crossing the river to Gloucester and overpowering the force under General de Choisy, which was then guarding that position, to fly for his life, through Virginia, Pennsylvania, and the Jerseys, to New York. As no time could be lost, the attempt was made during the same night, but a violent storm, coming on while the first detachment was still on the river, preventing the landing of part of it, the movement was abandoned; and those troops who had crossed the river returned to York during the next day. [Illustration: The Siege of Yorktown Painting by L. C. A. Couder.] On the morning of the next day (October 17th) the several new batteries, which supported the second parallel, opened fire; when Lord Cornwallis considered it no longer incumbent on him to attempt to hold his position at the cost of his troops, and at 10 A.M. he beat a parley and asked a cessation of hostilities, that commissioners might meet to settle the terms for the surrender of the posts of York and Gloucester.