Further evidence that the plan did not originally include the wide separation of two corps to the right to make the extended turning movement is found in Hooker's incomplete report, and in the wide interval in time between the marching of his corps and that of Mansfield. Hooker was ordered to cross the Antietam at about two o'clock in the afternoon of the 16th by the bridge in front of Keedysville and the ford below it. He says that after his troops were over and in march, he rode back to McClellan, who told him that he might call for reinforcements, and that when they came they should be under his command. Somewhat later McClellan rode forward with his staff to observe the progress making, and Hooker again urged the necessity of reinforcements. [Footnote: Official Records, vol. xix. pt. i. p. 217.] Yet Sumner did not receive orders to send Mansfield's corps to his support till evening, and it marched only half an hour before midnight, [Footnote: _Id_., p. 275.] reaching its bivouac, about a mile and a half in rear of that of Hooker, at 2 A.M. of the 17th. [Footnote: _Id_., p. 475.] After crossing the Antietam, Hooker had shaped his course to the westward, aiming to reach the ridge on which the Hagerstown turnpike runs, and which is the dominant feature in the landscape. This ridge is about two miles distant from the Antietam, and for the first mile of the way no resistance was met. However, his progress had been observed by the enemy, and Hood's two brigades were taken from the centre and passed to the left of D. H. Hill. Here they occupied an open wood (since known as the East Wood) northeast of the Dunker Church. Hooker was now trying to approach the Confederate positions, Meade's division of the Pennsylvania Reserves being in the advance. A sharp skirmishing combat ensued, and artillery was brought into action on both sides. I have mentioned our hearing the noise of this engagement from the other extremity of the field in the fading light of evening. On our side Seymour's brigade had been chiefly engaged, and had felt the enemy so vigorously that Hood supposed he had repulsed a serious effort to take the wood. Hooker was, however, aiming to pass quite beyond the flank, and kept his other divisions north of the hollow beyond the wood, and upon the ridge which reaches the turnpike near the largest re-entrant bend of the Potomac, which is only half a mile distant. Here he bivouacked upon the slopes of the ridge, Doubleday's division resting with its right upon the turnpike, Ricketts's division upon the left of Doubleday, and Meade covering the front of both with the skirmishers of Seymour's brigade. Between Meade's skirmishers and the ridge were the farmhouse and barn of J. Poffenberger, on the east side of the road, where Hooker made his own quarters for the night. Half a mile further in front was the farm of D. R. Miller, the dwelling on the east, and the barn surrounded by stacks on the west of the road.