Willcox's division reported to me about two o'clock, and would have been up earlier, but for a mistake in the delivery of a message to him. He had sent from Middletown to ask me where I desired him to come, and finding that the messenger had no clear idea of the roads by which he had travelled, I directed him to say that General Pleasonton would point out the road I had followed, if inquired of. Willcox understood the messenger that I wished him to inquire of Pleasonton where he had better put his division in, and on doing so, the latter suggested that he move against the crests on the north of the National road. He was preparing to do this when Burnside and Reno came up and corrected the movement, recalling him from the north and sending him by the old Sharpsburg road to my position. As his head of column came up, Longstreet's corps was already forming with its right outflanking my left. I sent two regiments [Footnote: In my official report I said one regiment, but General Willcox reported that he sent two, and he is doubtless right. For his official report, see Official Records, vol. xix. pt. ii. p. 428.] to extend my left, and requested Willcox to form the rest of the division on my right facing the summit. He was doing this when he received an order from General Reno to take position overlooking the National road facing northward. [Footnote: _Ibid_.] I can hardly think the order could have been intended to effect this, as the turnpike is deep between the hills there, and the enemy quite distant on the other side of the gorge. But Willcox, obeying the order as he received it, formed along the Sharpsburg road, his left next to my right, but his line drawn back nearly at right angles to it. He placed Cook's battery in the angle, and this opened a rapid fire on one of the enemy's which was on the bastion-like hill north of the gorge already mentioned. Longstreet's men were now pretty well up, and pushed a battery forward to the edge of the timber beyond Wise's farm, and opened upon Willcox's line, enfilading it badly. There was a momentary break there, but Willcox was able to check the confusion, and to reform his lines facing westward as I had originally directed; Welch's brigade was on my right, closely supporting Cook's battery and Christ's beyond it. The general line of Willcox's division was at the eastern edge of the wood looking into the open ground at Fox's Gap, on the north side of the Sharpsburg road. A warm skirmishing fight was continued along the whole of our line, our purpose being to hold fast my extreme left which was well advanced upon and over the mountain crest, and to swing the right up to the continuation of the same line of hills near the Mountain House.