The American Civil War, War Between State or whatever you want to call it, brought many talented generals to prominance in the annuals of American and world history.
Of those men we widely recognise Robert E. Lee, Thomas J. 'Stonewall' Jackson, James Longstreet, Nathan Bedford Forrest, U.S. Grant, William Tecumseh Sherman, George Henry Thomas and Phillip Sheridan as the best of the conflict, with perhaps a few personal choices thrown in.
But without War in the 1860's it can be pretty much assumed than none of these men would rise to prominance as they did, unless some other major conflict occured.
So what would be the fate of the Generals of the Union and Confederate forces if there was no ACW?
Several Generals, pre-war, were heavilly involved in politics, some were involved in the church and most were involved in the military. What would be possible for these men to do with their lives without the ACW?
EDIT: I meant to generalise this and ask what any General from either side could accomplish...not just the affore mentioned Generals in this post.