Some writers have attempted to explain and justify Sherman's action in taking with him so large an army, while leaving Thomas one so much smaller, on the ground that he might meet in his march to the sea such opposition as possibly to require so large a force to overcome it. But to any one familiar with the facts, and to no one more than to Sherman, his army of 60,000 men was evidently all out of proportion to any possible resistance it could meet in Georgia. But when he should start northward from Savannah the case would become vastly different. At any point in the Carolinas he might possibly meet the whole of Lee's army. That is to say, Sherman's ulterior plan could not be prudently undertaken at all without an army as large as that with which he actually marched to the sea, namely, 60,000 men. Indeed, as the records show, Sherman considered a long time before he decided that he could spare the Twenty-third Corps to go back and help Thomas. If any question can possibly exist as to what was the essential part of Sherman's plan in marching to Savannah, what other possible military reason can be given for that march except to make the subsequent march to Virginia with so large an army? Why change his base to Savannah? What was he to operate against after he got there?
Nothing could have been clearer to any military mind in the fall of 1864, than that if either Lee's or Hood's army could be captured or destroyed, the surrender of the other must necessarily follow very quickly, and the rebellion be ended. No man could have been more earnest than Sherman in his laudable desire to make the capture of his own adversary the beginning of the end. Sherman's well- known character leaves this beyond question. It is not possible that he could have preferred a manifestation of the power of the nation by destroying Southern property rather than by destroying a Southern army.
SHERMAN'S PURPOSE IN MARCHING TO THE SEA
But there was one objection—absolutely overruling, apparently, in Sherman's mind—to any further attempt by Sherman himself, with the main body of his army then in Georgia, to prosecute the primary military object of his campaign—the destruction or capture of Hood's army. To have done so would have conceded a temporary triumph to the chief of the Confederate armies, who had loudly proclaimed his purpose to drive Sherman out of Georgia, and protect that State from any further invasion. Such a concession, however temporary, was manifestly intolerable to Sherman's mind.( 1) Besides, Sherman had formed and announced, with Grant's cordial concurrence, a well-matured plan of future operations. As "master of the situation," he could afford to go on and substantially execute that plan, or at least the primary part of it,—the change of base,—treating almost with contempt the enemy's bold design to thwart him. Although this must, at least for the time being, compel him personally to forego and leave to a subordinate the primary operations of a military campaign,—those directly against the opposing army,—the joint action of Sherman and Grant, each with a powerful army, directly against Lee's army in Virginia, was the surest and probably the shortest possible way to end the war. Hence Sherman's broad view of the entire national military situation, including the moral aspect of it, which was then of very great importance, gave rise to that grand conception of far-reaching strategy which must ever stamp its author as a master of that great art.
Sherman having thus come to the conclusion that he personally must abandon the attempt to "catch Hood," as he called it, his "busy brain" did not fail to perceive every possible alternative plan of operations. The abandonment of Georgia by Hood had completely opened up two other alternatives, one of which was before not possible, and the other only partly so. The one was a movement upon Richmond or its communications to join with Grant in the capture of Lee's army, and the other was to destroy the military resources of the Southern Atlantic States. The first was too grand, and perhaps might seem too visionary, to be talked about at first, nor was any mention of it at that time necessary. Besides, events might possibly render the march to Richmond unnecessary or impracticable; or, possibly, Sherman might be compelled for some reason to make his new base at Pensacola or Mobile, though he was determined to make it at Savannah, if possible; and hence it was necessary to have, in reserve as it were, a sufficient logical reason for the preliminary operation, if that finally had to stand alone.
Again, that part of the original plan which contemplated the capture of Savannah in advance could not be carried out. Grant could not spare the troops from the east for that purpose. If that had been done, Sherman could have marched to Augusta, there replenished his supplies by the river from Savannah, and marched thence northward by the upland route instead of through the swamps of South Carolina. But, as it was, Sherman was, as he thought, compelled to go to Savannah first, capture that place himself, and make that the base for his northward march. Hence there was no need to say anything to anybody about what further was to be done until after Savannah was in Sherman's possession, and the time had arrived for him to consult Grant about the future. Yet in Sherman's remarkable letter to Grant, dated November 6, 1864,( 2) written after it was too late to have any influence upon Grant's approval of Sherman's march, he disclosed to Grant the ulterior object he had in view. In discussing the reasons for selecting the route to Savannah rather than either of the others, he said: "Incidentally I might destroy the enemy's depots at Macon and Augusta, and reach the sea-shore at Charleston or Savannah, from either of which points I could reinforce our armies in Virginia."
SHERMAN'S PURPOSE IN MARCHING TO THE SEA
Of course Grant, no less than Sherman, must have perceived instantly the full significance of Sherman's change of base to Savannah the moment that move was suggested. The question in what manner that concerted action between Grant and Sherman against Lee should be arranged could well be considered later, after that march had been made and a new base established at Savannah. The correspondence between Grant and Sherman previous to Hood's march to the west, including the letters of September 12 and 20, simply shows that neither had at that time conceived the possibility of any movement of Sherman toward Virginia. All their thoughts had reference to continuing operations in the south, Sherman's most important object being to get control of the Savannah River; or, as expressed, in his last words: "If you can whip Lee, and I can march to the Atlantic, I think Uncle Abe will give us a twenty days' leave of absence to see the young folks." Their joint action against Lee does not appear to have been suggested by either until Sherman's letter of November 6, which was probably received by Grant after Sherman started.
The first thought suggested to Sherman by Hood's movement "leaving open the road to Macon, as also to Augusta," as embodied in his despatch to Halleck on September 25, related simply to the opportunity thus offered to carry into effect without difficulty the original plan of a change of base to Savannah. But when Hood's movement had gone so far, and his designs were so fully disclosed, as practically to eliminate his army from the problem in the Atlantic States, Sherman determined to march as soon as possible, with the ulterior purpose to "reinforce our armies in Virginia." He telegraphed his determination to Grant on November 1, and on November 6 wrote him very fully, giving his reasons, including that to reinforce Grant. Hence Sherman was well able to say at Savannah on December 24: "I feel no doubt whatever as to our future plans. I have thought them over so long and well that they appear clear as daylight."
It should be observed that Sherman's letter of November 6 to Grant was strictly confidential. "I have still some thoughts . . . that should be confided to you [that is, to Grant and to nobody else] as a key to future developments." Neither Grant nor Sherman appears to have made any use of that "key" for the public benefit. But it now unlocks the store-house of Sherman's mind, and shows to the world more of the real character of the great strategist than any other public document he ever wrote.