The chance-medley of troops hardly aggregated one thousand officers and men, an entirely inadequate number for the defence of the “horseshoe”; but they were gradually succored, after the beginning of the desperate wrestle, by the second brigade and one regiment of the third brigade of Negley's division, and also by Brannan's third brigade under Colonel Van Derveer, who, after taking a decisive part in repelling Breckinridge's division, had been led by the rising roar of battle on Snodgrass Hill to march of his own accord to the relief of his division commander. But even these reinforcements increased the defenders by only about fifteen hundred, and would have left their total less than one-fifth of the number Longstreet could bring against them. These overwhelming odds would doubtless have overpowered them in one of the early rebel onsets, had not, luckily, further aid come in time by the appearance upon the scene of General Granger, with the greater part of the reserve corps. Granger had been charged with guarding the lower crossings of the Chickamauga and the road from Ringgold to Chattanooga. He had heard the heavy firing in the direction of the army from 10:30 A.M., and, after listening to its swelling intensity for some time with growing anxiety, he determined to hurry to the front as quickly as possible without waiting for a call. In this, as General Rosecrans well says of him, he followed “the instinct of a true soldier.” Leaving Colonel McCook's brigade to watch the Ringgold road, he started with General Whitaker's and Colonel Mitchell's brigades, and two additional regiments under the direct command of Major-General Steedman, soon after eleven o'clock. The force represented a total of thirty-seven hundred officers and men. After marching about two miles, he was suddenly fired upon by rebel skirmishers and a section of artillery. It was part of Forrest's cavalry which was guarding the rebel right. Granger stopped long enough to brush them aside, but moved on, after satisfying himself that they were only a small body and ordering up McCook's brigade
