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The Battle of Chickamauga.

Colonel Dan.McCook, of Granger's reserve corps, who had been posted on the road leading to Reed's Bridge, on the evening of the 18th, made a reconnoissance to Chickamauga Creek as far as Reed's Bridge, which he burned.On the 19th, meeting Thomas, he reported that an isolated brigade of the enemy was on the west side of the creek, and as the bridge was destroyed a prompt movement in that direction might succeed in capturing the entire force.Thomas ordered Brannan to post a brigade on the road to Alexander's Bridge as support to Baird, and with his other brigades to reconnoitre the road to Reed's Bridge in search of this brigade of the enemy.Brannan moved at nine o'clock A.M., and Baird, under orders from Thomas, threw forward his right wing so as to get into line with Brannan.

Baird was also ordered to keep a sharp outlook on his right flank and watch the movements of the enemy in that quarter.Shortly after these movements a part of Palmer's division reported to Thomas and was placed in position on the right of Baird.Rosecrans, when he sent Thomas to the left--the critical point--told him that he was to hold the road to Rossville, and if hard pressed, that he should be re-enforced with the entire army.

Under Bragg's orders, Walker's corps on the 18th crossed the west side of Chickamauga a little below Alexander's Bridge and then moved up the stream opposite this point.Bushrod Johnson's command the same day crossed at Reed's bridge, and then marched up the stream some three miles and took position on the morning of the 19th.

Walker resumed his movement to his left up the stream, under the impression that our centre was still at Lee and Gordon's Mills, Bragg's plan being to mass Walker's and Johnson's commands and attack our left flank.The advance movement of Brannan's division, Croxton's brigade in front, about ten o'clock encountered the enemy, being the cavalry under Forrest with Wilson's and Ector's brigades of infantry, and drove them nearly half a mile, when it met with obstinate resistance.This reconnoissance of Brannan in pursuit of the brigade reported by Dan.McCook developed the relative position of the opposing contending forces, which up to this time was unknown to the respective commanders of each.It gave to Bragg the knowledge that his right was greatly overlapped by Thomas on our left, and that his flank was in danger of being turned.It compelled him at once to halt Walker's command on its march, and to direct it to retrace its steps and reinforce Forrest, now engaged with Croxton, whose movement brought on the battle of Chickamauga before Bragg had his troops in the position ordered.

Thomas then ordered Baird's division forward to Croxton's support.

Moving at once with two brigades on the front, with Starkweather's in reserve, Baird and Croxton drove the enemy steadily for some distance with great loss, capturing many prisoners.Croxton's brigade having exhausted its ammunition in the severe fighting of over an hour, was then moved to the rear, and Brannan's and Baird's divisions with united forces drove the enemy from their immediate front.Here the line was halted and readjusted.Baird learning from his prisoners that the rebel army was in heavy force on his immediate front, gathering for an attack in mass, drew back his right wing and waited the assault of Bragg's right on his line, which was made in heavy force by Walker, who had reached his new position.Before Baird had completed the reforming of his line, Walker's corps, in overwhelming numbers was upon him, assaulting Scribner's and King's brigades, and driving them back in disorder.

McCook, early on the morning of the 19th, had taken position with his corps at Crawfish Spring, and was now beyond the extreme left of the rebel army, massing his troops at this point and waiting for orders.At a little after ten o'clock in the morning he was directed to take command of the right and the cavalry on that flank.