Military.com poses the question: Could YOU Have Won the Battle of Gettysburg?
In this simulation game, you take on the role of General Robert E. Lee as you command the forces of the Confederate Army beginning with their initial clashes with Union soldiers on the outskirts of town, on through the final push two days later. Can you pull off a victory where one of the greatest generals in American history failed to win? I was able to do it: my command of the Army of Northern Virginia handily split the Union lines and captured several thousand prisoners from the Army of the Potomac in the process.
Hit the link above and start playing. It's pretty fun! And if you've ever seen the wonderful movie Gettysburg, that will probably help you a lot.