Unfortunately St. Leger received information the preceding day of Herkimer's approach, and, early in the morning, placed a strong party, composed of regulars and Indians, in ambuscade on the road along which he was to march. His first notice of it was given by a heavy discharge of small arms, which was followed by a furious attack from the Indians with their tomahawks. He defended himself with resolution; but was defeated with great slaughter. The general and several of the field officers were wounded; and many others, among whom were several persons of distinction, were killed or taken prisoners. The loss was estimated at four hundred men. The destruction was prevented from being still more complete, by the very timely sortie made by Lieutenant Colonel Willet, which checked the pursuit, and recalled those engaged in it to the defence of their own camp. As soon as Gansevoort understood that Herkimer was advancing, the sortie which he had planned was made. Lieutenant Colonel Willet fell on the camp of the besiegers, and routed them at the first onset. After driving them, some into the woods, and others over the river, he returned to the fort without the loss of a man. Burgoyne had received early intimation of the arrival of St. Leger before fort Schuyler; and was aware of the advantage to be derived from an immediate and rapid movement down the Hudson. But the obstacles to his progress multiplied daily, and each step produced new embarrassments. Not more than one-third of the horses expected from Canada had arrived; and Schuyler had been active in removing the draft cattle of the country. With unremitting exertion, he had been able to transport from fort George to the Hudson, a distance of eighteen miles, only twelve batteaux, and provisions for four days in advance. The defectiveness of his means to feed his army until it should reach the abundant country below him, presented an impediment to his farther progress, not readily to be surmounted. The difficulty of drawing supplies from fort George would increase every day with the increasing distance; and the communications, already endangered by a considerable body of militia assembling at White Creek, could be secured only by larger detachments from his army than he was in a condition to make. These were strong inducements to attempt some other mode of supply. [Sidenote: Colonel Baum is detached to seize the magazines at Bennington.] It was well known that large magazines of provisions for the use of the American army were collected at Bennington, which place was generally guarded by militia, whose numbers varied from day to day. The possession of these magazines would enable him to prosecute his ulterior plans without relying for supplies from Lake George; and he determined to seize them.