Between four and five in the morning, the signal was given; and the several divisions moved to the assault under a violent storm of snow. The plan was so well concerted, that from the side of the river St. Lawrence, along the fortified front round to the basin, every part seemed equally threatened.[22] Montgomery advanced at the head of the New York troops, along the St. Lawrence, by the way of Aunce de Mere, under Cape Diamond. The first barrier on this side, at the Pot Ash, was defended by a battery, in which a few pieces of artillery were mounted; about two hundred paces in front of which was a block-house and picket. The guard placed at the block-house being chiefly Canadians, after giving a random and harmless fire, threw away their arms, and fled in confusion to the barrier. Their terrors were communicated to those who defended this important pass; and from the intelligence afterwards received by the American prisoners in Quebec, it appears that the battery was for a time deserted. [Footnote 22: Letter of Governor Carleton.] [Sidenote: Death of Montgomery.] Unfortunately, the difficulties of the route rendered it impossible for Montgomery to avail himself instantly of this first impression. Cape Diamond, around which he was to make his way, presents a precipice, the foot of which is washed by the river, where such enormous and rugged masses of ice had been piled on each other, as to render the way almost impassable.[23] Along the scanty path leading under the projecting rocks of the precipice, the Americans pressed forward in a narrow file, until they reached the block-house and picket. Montgomery, who was himself in front, assisted with his own hand to cut down or pull up the pickets, and open a passage for his troops: but the roughness and difficulty of the way had so lengthened his line of march, that he found it absolutely necessary to halt a few minutes. Having re-assembled about two hundred men, he advanced boldly and rapidly at their head, to force the barrier. One or two persons had now ventured to return to the battery, and seizing a slow-match, discharged a gun, when the American front was within forty paces of it. This single and accidental fire proved fatal to the enterprise. The general, with Captains M'Pherson and Cheeseman, the first of whom was his aid, together with his orderly sergeant and a private, were killed upon the spot. The loss of their general, in whom their confidence had been so justly placed, discouraged the troops; and Colonel Campbell, on whom the command devolved, made no attempt to reanimate them. This whole division retired precipitately from the action, and left the garrison at leisure to direct its undivided force against Arnold. [Footnote 23: Annual Register.]