It being a point of great moment to conceal the real object of this movement, the march of the army was continued until the 31st, in such a direction as to keep up fears for New York; and a considerable degree of address was used to countenance the opinion that the real design was against that place. The letters which had been intercepted by Sir Henry Clinton favored this deception; and so strong was the impression made, that after it became necessary for the combined army to leave the route leading down the Hudson, he is stated to have retained his fears for New York, and not to have suspected the real object of his adversary, until he had approached the Delaware, and it had become too late to obstruct the progress of the allied army towards Virginia. He then resolved to make every exertion in his power to relieve Lord Cornwallis, and, in the mean time, to act offensively in the North. An expedition was planned against New London, in Connecticut; and a strong detachment, under the command of General Arnold, was embarked on board a fleet of transports, which landed early in the morning of the 6th of September on both sides of the harbor, about three miles from the town. The result of this expedition—so infamous to Arnold—so inhuman—so contrary to all the laws governing modern warfare—is too well known to need recital here.
The progress of Washington could not consistently be arrested by such an incursion, ready, as in other circumstances he would have been, to have hastened to the defence of his fellow-citizens, against so vindictive a monster as that traitor had shown himself to be. Momentous results were now depending upon accelerated movements; and, accordingly, he urged his troops forward to the extent of their power.
Having made the necessary arrangements for the conveyance of his army down the Chesapeake, Washington, accompanied by several distinguished officers, French and American, hastened forward to Williamsburg, where, in an interview with the Count de Grasse, a system of operations for the contemplated siege was devised.
On the 25th of September, the last division of the allied troops arrived in James' river, and were disembarked at the landing near Williamsburg. On the 30th, the combined armies, twelve thousand in number, moved upon Yorktown and Gloucester, at which time the fleet of Count de Grasse proceeded up York river, with the double object of preventing the retreat of Cornwallis, and intercepting his supplies.
The village of Yorktown lies on the south side of York river. Its southern banks are high. In its waters a ship-of-the-line could ride with safety. Gloucester Point projects far into the river on the opposite shore. Both these posts were occupied by Cornwallis—the main body of the army being at York, under the immediate command of his lordship; Lieutenant-colonel Tarleton was stationed at Gloucester with a detachment of about six hundred men. Every possible effort had been made to fortify these posts. The interests involved were of incalculable magnitude. A failure now, Cornwallis could not but perceive, would put to hazard the royal cause. Every expedient, therefore, was adopted, which was calculated to secure his success, and give victory to the British arms.
Washington was equally impressed with the greatness of the enterprise in which he had embarked. The eyes of his countrymen were turned with intense interest to the issues of the impending contest. Nor can it be doubted that supplications went up from thousands of family altars, and from private closets, that the God of the Pilgrim Fathers would interpose for the salvation of a people, who, from their first landing on these shores, had regarded his honor as their highest object, and the enjoyment of rational liberty as their greatest privilege.
The preparations having now been completed, Yorktown was invested, upon which Cornwallis, abandoning all his advanced works, retired behind his principal fortifications. The former were immediately occupied by the besiegers.
It is not important to detail the events of each succeeding day, as this siege progressed. Washington, calm and collected, continued to extend his batteries towards the principal works of the enemy. The cannonade from the British line of defences was furious and incessant. On the 16th, a fierce sortie was made by the British, an American battery was stormed—the artillerists were overpowered, and seven cannon spiked; but the Americans rallied, and succeeded in recovering all that was lost.