While Sherman was driving Johnston out of Mississippi, Grant sent supplies of food and medicine to the enemy's sick at Raymond. If any man ever demonstrated the true spirit of Christianity, though without any display, Grant did so in his treatment of his own and his country's enemies. The Thirteenth Corps had been sent down to assist in the expedition up the Red River and into Texas. Grant was anxious to see Banks, in order to arrange a plan by which he might coöperate with him, and he went to New Orleans. While there he was severely injured by being thrown from his horse at a review. The animal was a strange one to him, and was frightened by a locomotive, and rushing against a vehicle, dragged his rider off. He was confined to his bed, and compelled to lie "flat on his back" for twenty days. As soon as he was able to be moved, he returned to Vicksburg, but was obliged to keep his bed until the latter part of September, though he attended to all the business of his department. During the summer Rosecrans had been operating in Tennessee and Northern Georgia, and had obtained possession of Chattanooga--the most important position between Richmond and the Mississippi. Bragg was manoeuvring to cut him off from Nashville, his base of supplies. Grant started large reënforcements, including Sherman's command, to the threatened point. On the 20th of September, Rosecrans was defeated, before any of Grant's army reached him, in the heavy battle of Chickamauga, and compelled to retire to Chattanooga. His army was saved only by the address and bravery of General Thomas, who held his position in the face of an immensely superior force. A delay of ten days in the delivery of Halleck's order to Grant prevented the latter from sending troops in season to be of service. Early in October Grant was directed, as soon as he was in condition to take the field,--for he was then able to move only on crutches,--to repair to Cairo, and report by telegraph. The order reached him at Columbus, and the next day, feeble as he was, he started for the point indicated, with his staff and headquarters. On his arrival he was instructed to meet an officer of the War Department in Louisville, Kentucky, to receive further orders. He started immediately by railroad, but at Indianapolis he met the secretary of war himself--Mr. Stanton. A new command, called forth by the emergency, had been created for General Grant--"The military division of the Mississippi," including all the territory south of the Ohio between the Alleghanies and the Mississippi, with the exception of that occupied by Banks. It comprised, besides his own department of the Tennessee, those of the Cumberland, under Rosecrans, and the Ohio, under Burnside, all of which were now placed under his command. Grant had suggested this step a year before, in order to insure harmonious operations.