Samwisep86, in order to answer your question, the chains of command in the Mississippi Valley have to graphed.
Major General Grant was both the commander of both the Department of the Tennessee & the Army of Tennessee. His authority extended from Cairo IL down the Mississippi Valley to Mississippi. Banks at Port Hudson did not report to Grant. Both Grant & Banks reported to Halleck, who commanded the Military Division of the Mississippi.
After Vicksburg, Grant became commander of the Military Division of the Mississippi & Sherman in turn.
Union Vicksburg Chain of Command
- Union Commander: Maj. Gen. Ulysses S. Grant
- Union Department: Department of the Tennessee (formed in Oct. 1862)
- Union Army: Army of the Tennessee
- Key Corps Commanders:
- XIII Corps: Maj. Gen. John A. McClernand
- XV Corps: Maj. Gen. William T. Sherman
- XVII Corps: Maj. Gen. James B. McPherson
The
Department of the Tennessee was a massive administrative and geographical command created in October 1862, stretching from Cairo, Illinois, down to northern Mississippi. This department provided Grant with the necessary manpower (numbering roughly 31,000 to 45,000 troops) and logistical freedom to launch his operations against Vicksburg.
Confederate Chain of Command
- Commander in Chief: President Jefferson Davis. Davis viewed Vicksburg as the absolute key to the Confederacy and ordered Pemberton to hold the city at all costs.
- Department Commander: General Joseph E. Johnston. As commander of the Department of the West, Johnston was Pemberton's superior. He advocated for a more mobile defense and attempting to relieve the city with a separate force, but was ultimately unable to stop Union Maj. Gen. Ulysses S. Grant's overwhelming advance.
- Army of Vicksburg Commander: Lieutenant General John C. Pemberton. Pemberton was tasked with defending the fortress city but was forced to divide his forces and was ultimately outmaneuvered by Grant.
- Divisional Commanders:Pemberton's army was organized into four primary infantry divisions:
- Major General Carter L. Stevenson
- Major General John H. Forney
- Major General Martin L. Smith
- Major General John S. Bowen
What paralyzed the Confederate operations at Vicksburg was meddling by President Davis. Pemberton received direct orders from the Commander & Chief over the head of General Joseph Johnston, the department commander. Davis' delusional belief in his military genius muddled command decisions in the Western Theater.
Davis prevented Joesph Johnston from exercising his authority as departmental commander. Pemberton, for his part, chose to follow orders from the president & ignore repeated commands from his immediate superior. We know how that worked out.
Pemberton was an army commander. Many of the commanders in Mississippi & adjacent territories did not report Pemberton. They reported to the Department Commander, Johnston. He had no authority to issued orders nor change commanders.
The TransMississippi was in a separate department. Neither Johnston nor Pemberton commanded any forces across the river.
Grant reported to Halleck. That had some problematical issues, however, the telegraph did not extend below Memphis. As a result, however much Halleck wished to meddle with & outright frustrate Grant's out of the box operations, events out raced his orders. Famously a staff officer showed up at Grant's HQ during the siege of Vicksburg with orders for Grant to send a significant reinforcement to Porter's floundering command at Port Hudson. A Nelsonian blind eye was turned & the staff officer was never seen again.
Grant was dealing with political influences. Major General McClerland of Illinois was very useful politically & from his ability to rally men to the ranks. One of Grant's strengths was that he followed Lincoln's orders without complaint. Once McClerland had both out lived his political & military utility, into the trash can he went.
That being said, it was Grant's duty as both department & army commander to recommend deserving officers for promotion & those found to be wanting to be passed over or dismissed. That was routine.
If you want to know what Grant's telegraphic messages to & from Washington were, let me introduce the Eckert Collection at the Huntington Library in California.
After the war, Thomas Eckert, who commanded the U.S. Military Telegraph Station in Washington D.C. took the ledger books home with him… all of them. Code books included. It quite a source.
Link
hdl.huntington.org
You probably want to know what Assistant Secretary of War Dana was reporting from Grant's HQ. Here are the bespoke signal ledgers where Dana's eyes only dispatches to Lincoln were recorded.
Link
hdl.huntington.org
Union & Confederate Commanders' Bios
Link
A listing of commanders serving during the Vicksburg campaign.
www.nps.gov