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 of strong indications of their withdrawal from Lafayette, but nothing was known at the army headquarters of the direction in which the bulk of their forces had subsequently moved. Their drift down the Chickamauga towards our left, however, was sufficiently recognized, by the time named, to produce an order dated September 16, 8:05 A.M., which showed that Rosecrans was then roused to the great gravity of the situation. This, summarily stated, was that the enemy with his whole army was practically half a day's march nearer to Chattanooga than himself, and had to push only a few miles to the eastward to get between him and the town. The order required Thomas to concentrate his corps, provided with three days' rations and extra ammunition, between Gower's and Bird's Mills, so as to command the Chattanooga Road, and “to do it to-day and as secretly as possible.” This meant a movement to the left down the Chickamauga so as to bring his corps close to Crittenden's right. Thomas received the order at 3:30 P.M., but failed to comprehend its urgency probably because he was not informed of the enemy's designs and considered it unwise to leave his position before the arrival of McCook; hence he answered: “General McCook's troops have not yet arrived. I will send Baird's and Negley's divisions to take position to-morrow morning, and Reynolds's and Brannan's the day following.” To this came response from the chief of staff, dated 8:45 P.M.: “The General Commanding fears that the movement will be too late if delayed till the time you mention. The enemy seems to be massing on our left, and the General Commanding desires that our flank movement to the left may be accomplished as soon as possible.” With this exchange of despatches the day went by, and General Thomas did not get under way before the morning of the 17th, but was in the new position by evening, with his left connecting with the Twenty-first Corps at Owen's Ford.

It has already been mentioned that the Twentieth Corps did not effect contact with Thomas until the 17th, when