Well, after quite a hiatus, I am back. And since I have been delving into the opening campaigns of Grant in 1862, I figured that this would be as good a place to start as any!
I have to agree with sam. He said that strategically, Vicksburg and politically Gettysburg. There wasn't much strategic importance to Gettysburg, except that it turned back a Southern invasion of Northern soil. What it did do was sound a death knell for the Army of Northern Virginia. While not out for the count, they lost 23,000 irreplaceable men, which was only exacerbated by the bloody battles of the Overland Campaign and the siege of Petersburg. While not strategically critical, it was a vast boost to morale. This was the greatest invasion made by Lee, and it was turned back. No war aims were achieved by this victory. It was pivotal, but not the most pivotal, battle.
Vicksburg, on the other hand, achieved a stated war aim. Take the Mississippi and cut the Confederacy in two. Now, with New Orleans in Union hands, it was of no use as a port, so the Mississippi is not a viable trade route. But by holding Vicksburg, the Confederates kept Union boats from easily getting from Missouri, Kentucky, etc. to the lower reaches of the Father of Waters and the Deep South. With Vicksburg captured and the river open, they (the Union) didnt' have to take roundabout routes to get there anymore, making transport easier.
But I would have to say that the most pivotal battle was Ft. Donelson. It showed the vulnerability of the Confederacy and the beginnings of Grant's genius (though he made quite a few mistakes in this campaign, in my opinion.) Virginia was just a distraction. It was back and forth, the same ground being fought over time and again (e.g Winchester, Va, which changed hands dozens of times.) While great battles were fought there, the pivotal battles were in the west. That is where the Confederacy lost. If Joe Johnston had stayed in the east and Lee gone west, things may have turned out differently. Grant and Lee from 1862 on? Sounds like a what if to me!!
