Wilson graduated in 1860 in the Topographical Engineers, and was first assigned to duty in Oregon, where he remained till July, 1861. In the fall of that year his active service in the war began, and he rose from one position to another, in the East and West, till, while on General Grant's staff, he was made a brigadier-general in the fall of 1863 in reward for services performed during the Vicksburg campaign and for engineer duty at Chattanooga preceding the battle of Missionary Ridge. At my request he was selected to command the Third Division. General Grant thought highly of him, and, expecting much from his active mental and physical ability, readily assented to assign him in place of General Kilpatrick. The only other general officers in the corps were Brigadier-General Wesley Merritt, Brigadier-General George A. Custer, and Brigadier-General Henry E. Davies, each commanding a brigade.
In a few days after my arrival at Brandy Station I reviewed my new command, which consisted of about twelve thousand officers and men, with the same number of horses in passable trim. Many of the general officers of the army were present at the review, among them Generals Meade, Hancock, and Sedgwick. Sedgwick being an old dragoon, came to renew his former associations with mounted troops, and to encourage me, as he jestingly said, because of the traditional prejudices the cavalrymen were supposed to hold against being commanded by an infantry officer. The corps presented a fine appearance at the review, and so far as the health and equipment of the men were concerned the showing was good and satisfactory; but the horses were thin and very much worn down by excessive and, it seemed to me, unnecessary picket duty, for the cavalry picket-line almost completely encircled the infantry and artillery camps of the army, covering a distance, on a continuous line, of nearly sixty miles, with hardly a mounted Confederate confronting it at any point. From the very beginning of the war the enemy had shown more wisdom respecting his cavalry than we. Instead of wasting its strength by a policy of disintegration he, at an early day, had organized his mounted force into compact masses, and plainly made it a favorite; and, as usual, he was now husbanding the strength of his horses by keeping them to the rear, so that in the spring he could bring them out in good condition for the impending campaign.
Before and at the review I took in this situation, and determined to remedy it if possible; so in due time I sought an interview with General Meade and informed him that, as the effectiveness of my command rested mainly on the strength of its horses, I thought the duty it was then performing was both burdensome and wasteful. I also gave him my idea as to what the cavalry should do, the main purport of which was that it ought to be kept concentrated to fight the enemy's cavalry. Heretofore, the commander of the Cavalry Corps had been, virtually, but an adjunct at army headquarters—a sort of chief of cavalry—and my proposition seemed to stagger General Meade not a little. I knew that it would be difficult to overcome the recognized custom of using the cavalry for the protection of trains and the establishment of cordons around the infantry corps, and so far subordinating its operations to the movements of the main army that in name only was it a corps at all, but still I thought it my duty to try.
At first General Meade would hardly listen to my proposition, for he was filled with the prejudices that, from the beginning of the war, had pervaded the army regarding the importance and usefulness of cavalry, General Scott then predicting that the contest would be settled by artillery, and thereafter refusing the services of regiment after regiment of mounted troops. General Meade deemed cavalry fit for little more than guard and picket duty, and wanted to know what would protect the transportation trains and artillery reserve, cover the front of moving infantry columns, and secure his flanks from intrusion, if my policy were pursued. I told him that if he would let me use the cavalry as I contemplated, he need have little solicitude in these respects, for, with a mass of ten thousand mounted men, it was my belief that I could make it so lively for the enemy's cavalry that, so far as attacks from it were concerned, the flanks and rear of the Army of the Potomac would require little or no defense, and claimed, further, that moving columns of infantry should take care of their own fronts. I also told him that it was my object to defeat the enemy's cavalry in a general combat, if possible, and by such a result establish a feeling of confidence in my own troops that would enable us after awhile to march where we pleased, for the purpose of breaking General Lee's communications and destroying the resources from which his army was supplied.
The idea as here outlined was contrary to Meade's convictions, for though at different times since he commanded the Army of the Potomac considerable bodies of the cavalry had been massed for some special occasion, yet he had never agreed to the plan as a permanency, and could not be bent to it now. He gave little encouragement, therefore, to what I proposed, yet the conversation was immediately beneficial in one way, for when I laid before him the true condition of the cavalry, he promptly relieved it from much of the arduous and harassing picket service it was performing, thus giving me about two weeks in which to nurse the horses before the campaign opened.
The interview also disclosed the fact that the cavalry commander should be, according to General Meade's views, at his headquarters practically as one of his staff, through whom he would give detailed directions as, in his judgment, occasion required. Meade's ideas and mine being so widely divergent, disagreements arose between us later during the battles of the Wilderness, which lack of concord ended in some concessions on his part after the movement toward Spottsylvania Court House began, and although I doubt that his convictions were ever wholly changed, yet from that date on, in the organization of the Army of the Potomac, the cavalry corps became more of a compact body, with the same privileges and responsibilities that attached to the other corps—conditions that never actually existed before.