The withdrawal of McClellan and the accession of the weak and vacillating Burnside to command was followed by a re-arrangement of the Army of the Potomac into three grand divisions, and a re-assignment of leading generals. Franklin was placed in command of the Third Grand Division, consisting of the First Corps under General Reynolds, and the Sixth Corps under General Smith. In the abortive Fredericksburg campaign which followed, these corps had the extreme left of the Union line, but it should have been evident from the start that with the opposing armies separated by a broad river occupying a deep valley, from three-quarters of a mile to a mile and a half between the opposite crests, the movement which was to bring on the battle must necessarily be fought under extraordinary disadvantages to the attacking army. In the mind of those who were to carry out the details of the movements, success must have seemed hopeless from the first. Burnside was from the beginning of the campaign overcome by the weight of his responsibilities, and between tears at one time and lack of sleep at another, his fatuous mind failed to evolve for itself, or to accept from others a definite and comprehensive plan of operations. He seemed at successive times to have had hopes of surprising Lee, of breaking his center and overwhelming his left, of seizing two important points in his main line of defence and completely turning his left, but withal it is certain that he gave to none of these operations sufficient attention to justify the slightest hope that it could be successfully carried into effect.