Originally Posted by Bil H
I had some of those links already, but a few were new to me and very helpful.
Have you tried the Official Records?
Here is the excerpt of Colonel Evans' report, Seventh Brigade, First Corps / Army of the Potomac. The best I could find was an aggregrate (Evans reports as 1709). However, you might come closer if you go over corps returns either the preceding or following months.
Returns from August 1861:
Went digging into the sub reports from the battle and this is what I turned up from the Confederate side (here http://ebooks.library.cornell.edu/cg...=root;size=100
Three companies Virginia Cavalry: 50
8th Virginia Infantry: 375
18th Mississippi Infantry: 500
17th Mississippi Infantry: 600
One Company, 13th Mississippi Infantry: 60