Yeah, it would be a really good story of redemption too, since after his campaign of movement around Jackson and Raymond and during the siege, Grant went on a real bender out of boredom, so much so that his staff officers brought his wife down from Galena, Illinois to dry him out in time to accept Vickburg's surrender. Of course, Grant fully recovered and went on to greater things. It's too bad that no one has ever made a movie dedicated solely to him and his friend Sherman. It would be a good one.
Marszalek's book on Sherman would make a good movie. Not much action, but a fascinating character study.