Is there any literature apart from the Official Records which list regiment numbers engaged in a battle? Essentially, it would be a statistical reference work, and for each battle you would have the names of the regiments involved in the fighting (for both sides obviously), and a rough estimate for the number of men involved in the fighting in each regiment. Or is this something that one would have to laboriously find out for oneself by consulting numerous works on specific battles? I know that this info is available for a few well-known battles (e.g. Gettysburg), but I was wondering if there was a reference that did it for a large number of battles.