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 right, and to be ready to send reinforcements to Thomas at a moment's warning. Twenty minutes later, another order was despatched to McCook requiring him to send two brigades of Sheridan's division immediately, and with all despatch, to support Thomas, and to let the third brigade follow as soon as the lines could be drawn in sufficiently. McCook received the two orders within six minutes of each other, and lost no time in executing them. Lytle's and Walworth's brigades were taken from the extreme right and started for the left at the double quick. After General Wood had moved to occupy Negley's position, and when Davis's division was ordered to the front, Van Cleve's was also moved forward twice by the direction of the General Commanding, for the better support of Wood and Davis. Sheridan's third brigade, under Colonel Laiboldt, was held in reserve to Davis.

General Rosecrans states in his report that one of Thomas's aides, who brought him a request for further help, informed him at the same time that Brannan was out of line and Reynolds's right thereby exposed. The aide was mistaken, as Brannan was really in echelon slightly in the rear of Reynolds's right; but the Commander-in-chief acted without further inquiry on the wrong information, and at once sent an aide on the gallop to General Wood with the following order: “September 20, 10:45 A.M.: The General Commanding directs that you close up on Reynolds as fast as possible and support him.” The order was received at about eleven o'clock by Wood, who was then a short distance in the rear of the centre of his command, and he immediately proceeded to carry it out. General McCook was with him at the time, and must have received his own order to move Sheridan's brigade about the same time, shortly before or after. He says in his report that, simultaneously with the movement of Sheridan and much to his surprise, Wood's division left its position in the line. This naturally suggests the question why McCook did not make an effort to prevent the execution of the