In central Tennessee, Maj. Gen. William S. Rosecrans was in command of the Army of the Cumberland. In October 1862, he had relieved Maj. Gen. Don Carlos Buell as head of the army. By January 1, 1863, Rosecrans had fought a Confederate army at the Battle of Stones River, forcing the Southerners to withdraw. Rosecrans was then poised to begin a campaign to drive the Confederates from the eastern half of the state.

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In northern Virginia, Maj. Gen. Ambrose Burnside led the Union Army of the Potomac at the start of 1863. But due to Burnside’s crushing defeat at the Battle of Fredericksburg in December 1862, Lincoln had lost faith in his ability to lead the army, and he soon replaced him with Maj. Gen. Joseph Hooker. Lincoln had his doubts about Hooker, too, mainly due to his vocal criticism of Burnside, but he had performed well as a corps commander and talked aggressively about what he intended to do in the spring campaign.

Politics played a major part in the initial stages of Grant’s advance on Vicksburg. In 1862, a politically appointed general named John A. McClernand, a Democrat, had been authorized by Secretary of War Edwin M. Stanton to raise troops in several northwestern states as an expeditionary force for use in capturing Vicksburg. The wording of the order made it appear that McClernand would be in command of the operation. But after McClernand had raised the troops and sent them to Memphis, Grant simply took control of the soldiers for his operations down the Mississippi.

Although he disliked and distrusted McClernand, Grant wisely retained him as a corps commander, knowing that Lincoln wished to keep the Illinois Democrat in an important capacity for political reasons. McClernand was not satisfied by the arrangements, and he appealed directly to Lincoln. The president responded directly to McClernand: ‘I have too many family controversies (so to speak) already on my hands to voluntarily, or so long as I can avoid it, take up another. You are now doing well–much better than you could possibly be if engaged in open war with Gen. Halleck. Allow me to beg that for your sake, for my sake, & for the country’s sake, you give your whole attention to the better work.’

Lincoln also let Grant know when he thought a particular project was especially important. The long winter months had hampered the offensive capabilities of Grant’s army. In order to keep his men occupied and make them feel they were making some headway against the Confederates, Grant had his soldiers work on cutting a canal that would bypass the Vicksburg defenses. Although Grant had little hope of success for the effort, Lincoln felt the project was important. In a January 25 telegram, Halleck told Grant: ‘Direct your attention particularly to the canal proposed across the point. The President attaches much attention to this.’

The president’s attention was also focused on the Army of the Cumberland and General Rosecrans in central Tennessee. Following Stones River, Rosecrans had the full support of the administration and was advised by Stanton, ‘There is nothing within my power to grant yourself or your heroic command that will not be carefully given.’ But Rosecrans stalled in making any further move against the enemy. As weeks dragged by, Rosecrans continued to request more supplies from the government while making no effort to move. Lincoln’s frustration mounted.

The government tried many different tactics to get Rosecrans to advance, but to no avail. Finally, in an apparent attempt to infuse some spirit of competition between Rosecrans and Grant, Halleck sent each a telegram that offered what could fairly be interpreted as a bribe. The general in chief told them that he was authorized to award a major generalcy in the Regular Army to the first commander who could win an ‘important, decisive victory.’ Instead of choosing to consider it an incentive for good performance, or at the very least ignoring it as Grant did, Rosecrans decided to be insulted by the message. He let his superiors know that he was offended, further worsening relations between himself and Washington.

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