WI Lee had listened to Longstreet?

This video (at around 34:00) mentions a proposal, made by Longstreet just after the victory at Chancellorsville, to send a corps or more of Confederate troops to the West, where the CSA was in trouble. Lee favored an invasion of the North (again), & got his way.

WI he hadn't?

Obviously, there would be no battle at Gettysburg.

What Confederate victories in the West might there be TTL that didn't happen OTL?

Would it have meant any Federal victories in the East that didn't happen OTL?

Would it have lengthened the war at all? Or ultimately not made any difference?
 
Longstreet's proposal was to take his Corps and the units that made up the Army of Relief join Bragg, and suggested that Johnston take command of the whole force. If Longstreet brings only McLaws' and Hood's Divisions, he adds 14,512 officers and men into Bragg's army of around 50,000 troops to attack Rosecrans' 80,000 troops. Longstreet’s proposal is sound on paper, but logistics makes execution difficult.

Historian Thomas Connelly observed that "Bragg's own transportation system had been on the verge of collapse since early 1863." IOTL after Chickamauga Longstreet complained to Bragg that his staff officers had not been provided with the means of supplying his troops. Unless the army's wagon train could be greatly expanded then the Army of Tennessee could not venture more than a few miles away from a secure rail-head. A logistical build up that would take more than a month is needed before the Army of Tennessee+ is ready to strike a blow.

Still, Longstreet’s arrival would certainly tip the balance of power in favor of Bragg in the Tullahoma Campaign. I think Rosecrans would have waited for Grant to return the IX Corps to Burnside for the invasion of East Tennessee. IOTL the Tullahoma Campaign could have been a close run affair had it not been for the squabbling of high command and the lack of troops to really secure the gaps. If Longstreet’s command stalled Rosecrans at the gaps, Bragg might have been able to convince Polk to launch a sweeping counterattack on the Federal right. Of course, this is the Army of Tennessee - such coordination is quite unlikely.

In the East, Lee might be in trouble. While the Army of the Potomac was bleeding from expiring 9-months and 2-years enlistment, Lee’s II and III Corps had been severely damaged. The Pennsylvania Campaign, though quite costly for Lee, ensured his army would survive into the next year. More than 45 miles of quartermaster and subsistence trains filled with impressed stores escaped Pennsylvania and Maryland along with 20,000 horses and mules seized and large herds of livestock. Throughout the rest of the summer Lee's men had enough meat, flour and fodder. All of which were unavailable in Virginia. Hence, I suspect that there would be a Pennsylvania Campaign. Lee saw that the Army of the Potomac was at its weakest numerically and needed supplies if he was to outlast his enemy. Perhaps Lee convinces Davis to strip coastal commands to form a IV Corps for Beauregard.
 
...Hence, I suspect that there would be a Pennsylvania Campaign. Lee saw that the Army of the Potomac was at its weakest numerically and needed supplies if he was to outlast his enemy. Perhaps Lee convinces Davis to strip coastal commands to form a IV Corps for Beauregard.
Interesting - perhaps even more interesting if Lee, knowing that he just sent his best offensive weapon out West, strives to focus on gathering supplies and pointedly avoids decisive battle (unless, of course, the AoP wants to reenact Fredricksburg somewhere in Pennsylvania). If this happens, does Lee task all of the cavalry with scouting / screening instead of allowing Stuart to break out and disrupt Union communications? Part of this decision may be based on whether there is an analog to TTL Battle of Brandy Station.
 
Interesting - perhaps even more interesting if Lee, knowing that he just sent his best offensive weapon out West, strives to focus on gathering supplies and pointedly avoids decisive battle (unless, of course, the AoP wants to reenact Fredricksburg somewhere in Pennsylvania). If this happens, does Lee task all of the cavalry with scouting / screening instead of allowing Stuart to break out and disrupt Union communications? Part of this decision may be based on whether there is an analog to TTL Battle of Brandy Station.
Perhaps, but in all honesty Stuart’s presence was not necessary for Lee to have had better intel on the Army of the Potomac. Stuart had left behind Jones’ and Robertson’s cavalry brigades for Lee. The problem was that Stuart ignored Robertson’s questionable performance at Brandy Station and left him in charge (by seniority), instead of sending the aggressive and competent Wade Hampton as Longstreet requested. Given that Longstreet’s Corps is absent, Stuart might have been forced to detach more of his command for scouting, but I think it was very in character for Stuart and Lee to aggressively raid in hopes of disrupting the Army of the Potomac’s movement.
 
Tennessee falls 4-6 months later and European hopes ride a little higher going into 1864. Overall unless the South gains two major victories over the North before the election the result doesn't change.
 
Weren't Lee and Longstreet just about to have a falling out at this point as well?
Not really, while the two had disparate views, they still had deep affection and respect for each other. When Longstreet was leaving to join Bragg, Lee, who had previously opposed the movement, put a hand on his shoulder and shook hands with Longstreet, essentially telling him to beat “those people out there”. This was after Gettysburg and Longstreet’s opposition to Lee’s directive to prepare for another offensive on August 31 (later known as the Bristoe Station Campaign).
 
if Lee, knowing that he just sent his best offensive weapon out West, strives to focus on gathering supplies and pointedly avoids decisive battle
That does seem unlikely, given Lee's preference for attacking. (He seems not to have adopted a posture of "strategic defense, tactical attack", which appears to have been Longstreet's idea.)
 
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