Hyperion said:Then leave Vicksburg to another Union army force, and pursue Jackson until you can either force him into a decisive battle, be it on Grant's terms or his, or until he retreats far enough way that even if his army is still operational, it will not be able to come back and hit you for several days at least.
Or Concentrate solely on Vicksburg, whether or not Jackson is there or not, and leave just enough troops to keep Jackson occupied, while the main army force, combined with reinforcements and the navy take Vicksburg. I did some research last night, and found out that the actual seige lasted only a couple of months, not the 4 to 5 months I originally suggested for the seige if Jackson was involved, so I'm thinking a seige would probably last from late November or early December to late January or some time in February.
Which would be more beneficial to winning the war: taking out Jackson's army, or taking out Pemberton's army and capturing Vicksburg and gaining control of the Mississippi, and putting a stranglehold on supplies being brought into the Confederacy overland across the Texas-Mexico border?
Well much of this is what I was posting about earlier. Now obviously taking out both Pemberton's & Jackson's forces out would be a great victory for the Union. But there are two problems. The first is I can't see where another Union army is coming from in order to place Vicksburg under siege whilst Grant & company go chasing off after Jackson. Even the Union has its limitations, as we'd be talking something like a further 70 000 troops or so if the OTL siege of Vicksburg is anything to judge by.
The next problem is Jackson. He is probably the best general on both sides. Sure he had his bad time during the Peninsular Campaign, but that was the exception & not the rule. So when planning for Jackson, you've got to have to accept that he'll realise what Grant is trying to make him do. This is why Jackson won't fall for getting trapped in Vicksburg. Similarly Jackson won't attack Grant's combined army. He'll only attack when the odds favour him. Study his Valley Campaign along with Chancellorsville & you'll know what I mean. And considering the dates involved for this AH Vicksburg Campaign, I'd say Jackson will be near the top of his game here.
Now the problem for the Union is actually two-fold. If Pemberton summoms up enough courage he may abandon Vicksburg. It'll piss off Davis back in Richmond, but he'll ensure that an army of 40 000 Rebs remains active. What Pemberton should do, once the town of Jackson Mississippi falls to Grant, is to leave Vicksburg with his army (although the town itself is left garrisoned with whatever militia is around), sweep to the south of the Union forces at Jackson, & meet up with Jackson's army to the east. Of course that's if Pemberton is using his military brain instead of listening to the politicians in Richmond.
This Reb combined army, now something like 80 000 strong, is now a real threat to the Union. Because, if Grant does as you suggest & wants to place Vicksburg under seige, the bulk of the Union army won't be facing the enlarged army of Jackson. As a result, Jackson could launch one of his lightning attacks &, before Grant knows it, his army could be routed, tumberling northward in confusion, where he'll have to start all over again. That wouldn't overly surprise me as Grant, in the OTL, had to try several times, via different ways, in order to get Vicksburg in the first place.
In other words, whatever Grant does, he shouldn't turn his back on Jackson. Vicksburg can wait whilst Jackson is around. Afterall it's not as if the city of Vicksburg is going anywhere.