So I just finished a great book called " Killer angels" which was a great introduction to the US Civil War, I don't really know a ton about the civil war but I have the bug now and have another book on the way. I did finish" Killer angels" with a couple of questions and I was hoping someone on here might be able to
tackle them for me.
1. Why was ( and still is) Lee considered a great General? From what I read his tactics cost the confederates that battle and Pickett's charge was a calamity.
2. If Lee had listen to Longstreet do you think the confederates could have won that battle?
3. If the confederates had won do you think that would have ended the war? If yes do you think the Union would have accepted the two state scenario or would they have eventually looked to retake the South?
Hindsight being 20/20 and all, the real issue ended up being how the war needed to be fought.
It was after the war that it came out Lee and Longstreet disagreed on a few things between Chancellorsville and Gettysburg, and it comes down to history on how contentious (or not) those disagreements were over those days they spoke about next steps.
Longstreet's writings suggested that he was concerned about manpower overall. He wanted to go with a defensive posture because he knew that even though Chancellorsville was arguably a success that the numbers needed to advance on Gettysburg would be overwhelming being a similar assault posture. Technically Longstreet was right, and "Pickett's Charge" did get through Union lines but it still failed because of that manpower issue. You would think 15K would be enough, and so did Lee, but in the end thousands of Confederate soldiers died and ultimately Lee was forced to withdraw. Over half of those sent into the assault died over Lee's assumptions of being able to take Union soldiers behind a wall in a dug in position.
You could argue that Lee's successes to the point of considering Gettysburg made him overconfident, perhaps arrogant, about what his men could accomplish. And that may have played out in those important meetings between Lee, Longstreet, and others in the days leading up to Gettysburg which the history books determined was Lee's failure to invade the North all that far.
In the end we are talking about a single battle where casualties were in the range of 23K Union Soldiers and 28K Confederate soldiers (give or take.) But even with those numbers the Union considered it a win with Lee so demoralized he offered a resignation that Davis did not accept.
To answer your questions:
1. Yes, Lee was still a great general winning plenty of battles before and after Gettysburg but his tactics at that battle (because of how Chancellorsville and others went) backfired causing enough dissension in the ranks. It becomes arguable how great of a general he was, arrogance notwithstanding he did plenty that could be considered military success.
2. Unsure that Lee could have won Gettysburg if fought a little differently. Longstreet was ultimately against not just a single assault but the idea of advancing into the North that way given the conditions of Union and Confederate strength at the time. And honestly Lee was wrong anyway at the end of that battle, the Union did not counter assault as he predicted and ultimately Lee's troops retreated under cover of night. The other thing to keep in mind is Longstreet is not without criticism, it has been argued that his issue with going into the Gettysburg campaign impacted him doing exactly what he was told and when perhaps assisting in the outcome of his tremendous losses from the assault he was charged with. In fact all of Lee's subordinate command ended up with some degree of military criticism for various actions during the Gettysburg campaign further suggesting Lee listening to Longstreet specifically would have been ultimately not very impacting to how things ended up.
3. No, even if the Union lost Gettysburg the numbers still suggested latter battles like Vicksburg, Chattanooga, Atlanta and the "Appomattox Campaign" would have occurred anyway. Lee lost too many at Gettysburg and even if only losing half of them in some victory it would not be enough to advance that much further north.
Ultimately there was no way Union command would have allowed enough to happen to end up at a two-state solution. Even with a few battles that might have gone differently if Confederate did something different it was unlikely the South could have done enough to wear down the North.