Interestion "what if" Gary. Good point, OD. So long as McC was in charge, thoroughly scattering Lee's army would have accomplished no more than diminished numbers of the reconstituted ANV with ample opportunity to concentrate and rebuild the remainder to a formidible force. There would have been a morale crisis in the Confederacy, but it is difficult to determine its effect. Now, if he'd have packed most of the
CSA off to POW camps, there might have been a probability.
As an aside, McC's slows was described on another forum as being held in thrall by the "Austerlitz Chimera." When asked for a definition, the poster provided: the dream of concluding a war with a single, definitive battle -- something that seems to have been within McC's grasp at Sharpsburg.
Ole