I'll just chime in again here. The thing about the east is...well you're pretty much screwed...BUT....here's one thing you can try in the future as the Yanks. and put this on your secret list

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Historically...what earned Burnside his promotion??
His coastal campaign in North Carolina. You have to get commanders in a position to win right?? Well...take your two or three best division commanders....send them on little "errands" on the coast and voila...a few victories against understrength fort garrisons and you should have yourself at LEAST one or two good 2-star generals.
NOW....if you really want to get gamey....you can plop them into Grant's army and leave the coast up to some lesser division commanders....but I would probably just bring them back to Washington to take over as Corps commanders. You must also remember....there were quite a few of the Union commanders that distinguished themselves during the "7-days" campaign...in which nearly EVERY engagement was, according to how the game engine would probably look at it, a Confederate loss.
I've YET to see any PBEM opponent of mine try what McClellan did historically. It almost worked historically, and it could probably come close in the game. Thinking back on it....it was actually quite a brilliant plan. In game terms...you'd free up Northern Virginia for a more able Corps commander to wreak havoc

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Perhaps taking Little Mac's army as far south as a landing at Norfolk. While most of this would require Mac to be active...even INACTIVE...his 120,000 man bohemoth of an army would have no problem with a small garrison at Norfolk.
Believe me...you can find ways to win...even with McClellan.