Will post some (rare, actual) data on Peninsula strengths tomorrow and give some impressions of the pre-war part of Rafuse's new book, McClellan's War.
Meanwhile, if you are interested in military reform, you may enjoy this Boydian thesis on swarming attacks (hat tip to John Robb).
The thesis has no positive Civil War examples. None. No surprise, as it aims to reform our army which is a Civil War army.