If, on the other hand, Thomas's reinforcements had arrived in time to enable him to take the initiative by moving against Hood from Pulaski or Columbia, then he might have drawn quite largely from his garrisons in the rear to reinforce his army in the field, since his "active offensive" operations would have fully occupied Hood's cavalry, and thus have prevented a raid in Thomas's rear. But until he was strong enough to advance, unless forced to the extreme necessity of defending Nashville, Chattanooga, and Decatur, and abandoning all else, Thomas could not prudently have reduced his garrisons or guards.
I knew nothing at that time of Sherman's instructions to Thomas, and little about the actual strength of Thomas's garrisons and railroad guards. But I was under the impression that some reinforcements must be available from his own department, and felt a little impatient about the long delay in their arrival, and hence telegraphed General Thomas, November 24, suggesting the concentration of R. S. Granger's troops and those along the railroad. The despatches to me at that time, to be found in the War Records,( 4) fully show the earnest determination of General Thomas to send forward reinforcements as soon as possible, and even in detail, and to fight Hood at or near Columbia. Indeed, those despatches misled me somewhat as to what I might expect.
AVAILABLE TROOPS NOT SENT TO THE FRONT
Notwithstanding this earnest desire, General Thomas does not appear to have realized the existence of a force available for the purpose he had in view. The railroad guards from Atlanta to Chattanooga or Dalton, withdrawn after Sherman started on his march, and convalescents, men returning from furlough and others going to the front, but failing to reach Sherman's army in time, all assembled at Chattanooga, made a surplus force at that point of about 7000 men.( 5) Some of these troops had been sent to East Tennessee, as well as all the mounted troops available in Kentucky, for the purpose of retrieving the disaster which had befallen the Tennessee military governor's troops there, under Gillem. But all sent from Chattanooga had been returned by November 21, about the time when Hood's advance from Florence had become certainly known. Yet it does not appear that General Thomas even inquired what force was available at Chattanooga until November 25, when, in reply to a telegram, he learned that Steedman could raise 5000 men (in fact, 7000), in addition to all necessary garrisons and guards, "to threaten enemy in rear," in case he should "get on Chattanooga railroad." It may then (November 25) have been too late to send those 5000 or 7000 men to the line of Duck River, or perhaps even to Franklin. They were sent to Nashville, reaching there after the battle of Franklin. If they had been ordered to Columbia by rail, via Nashville, as soon as Hood's advance was known to General Thomas, they must have reached Duck River some time before Hood attempted to cross that stream. This addition to the Fourth and Twenty-third Corps would have raised the infantry in the field to nearly an equality with that of Hood in fact, though not nearly to what Hood's force was then supposed to be. That increased force would doubtless have made it possible to prevent Hood from crossing Duck River anywhere near Columbia for several days, and perhaps to force him to select some other line of operations, or to content himself with sending his cavalry on another raid. In any case, the arrival of A. J. Smith a few days later would have enabled Thomas to assume the aggressive before Hood could have struck a serious blow at Thomas's army in the field. In view of the earnest desire of General Thomas to reinforce the army in the field at Columbia, there does not appear to be any rational explanation of the fact that he did not send those 7000 men from Chattanooga to Columbia. His own report states the fact about those "7000 men belonging to his [General Sherman's] column," but does not give any reason why they were not used in his "measures to act on the defensive." As General Thomas says: "These men had been organized into brigades, to be made available at such points as they might be needed." At what other point could they possibly be so much needed as that where the two corps were trying to oppose the advance of the enemy long enough for Thomas to get up his other reinforcements?
AVAILABLE TROOPS NOT SENT TO THE FRONT
General Thomas appears to have been puzzled by doubt whether Hood would aim for Nashville or some point on the Nashville and Chattanooga Railroad, and not to have realized that his own plan should have been to concentrate all his available force into one army, so as to move against the enemy with the greatest possible force, no matter what the enemy might do. With the exception of those 7000 men belonging to Sherman's column, Thomas had for necessary garrisons and railroad guards essentially the same number of men as had been employed in that service all the preceding summer,—no more and no less,—and the necessity for that service had not been very much diminished, except at and about Decatur, Stevenson, and Tullahoma, which Hood's advance from Florence had rendered of no further consequence at that time. But the 7000 men available at Chattanooga ought unquestionably to have been sent to Columbia, or at least moved up to Nashville or Franklin, where they could "join the main force," as suggested in my despatch of November 24 to Thomas,( 6) instead of being left in Chattanooga "to threaten enemy in rear."( 7) As suggested in my despatch of November 24, R. S. Granger's force and others along the railroad south of Duck River, as well as Steedman's, might have joined the main force at Columbia, if orders had been given in time, thus increasing the army in the field by fully 10,000 men.
If R. S. Granger's force had been left at Decatur, it would have drawn off from Hood's invading army at least an equal force to guard his bridges at Florence, or else would have destroyed those bridges and cut off his retreat after the battle of Nashville. This was practically what had been suggested by Sherman in his instructions to Thomas. But the withdrawal of Granger's troops and their detention at Murfreesboro', instead of sending them to "join the main force," served no good purpose at the time, and prevented their use in the capture of Hood's defeated and retreating troops. The failure to make this timely concentration was the one great fault in Thomas's action, instead of his delay in attacking at Nashville, for which he was so much criticized. But Hood's repulse at Franklin had made this previous mistake a matter of past history, and hence it was lost sight of in view of the imminent danger afterward supposed to exist at Nashville, just as the brilliant victory at Nashville was accepted as demonstrating the wisdom of all that had gone before, even including Sherman's division of his army between himself and Thomas before his march to the sea. Such is the logic of contemporaneous military history!
In my long conversations with General Grant on the steamer Rhode Island in January, 1865, I explained to him fully the error into which he had been led in respect to Thomas's action or non-action at Nashville in December, and he seemed to be perfectly satisfied on that point. But he did not ask me anything about what had occurred before the battle of Franklin, and hence I did not tell him anything.
In connection with the action of General Thomas previous to the battle of Franklin, the following instructions from General Sherman on October 31 are important: "You must unite all your men into one army, and abandon all minor points, if you expect to defeat Hood. General Schofield is marching to-day from here. . . . "( 8) Again, on the same date, he telegraphed: "Bear in mind my instructions as to concentration, and not let Hood catch you in detail."( 9)
Sherman thus gave the most emphatic warning against the mistake which Thomas nevertheless made by failing to concentrate all his own available troops until it was too late to meet Hood's advance, thus leaving two corps to bear the entire brunt of battle until the crisis of the campaign was passed at Franklin.