So, are we considering this essentially ASB? Because then I have a line-up planned out (noting that the good people can only occur in 1 place)
Union:
East:
AotP: Hancock
Ist corps: Reynolds (with Doubleday, Meredith, and Sykes)
IInd corps: Franklin (with Meagher, Caldwell, Zook)
Vth corps: Meade (division commanders Griffin, Warren, Chamberlain)
VIth corps: Sedgewick (Ricketts, um, Richardson, ....
)
XIIth corps: Slocum (Geary, Mansfield, Newton)
Cavalry: Buford
Total: ~130,000
Valley Army: McDowell
Ist corps: Pope
IInd corps: Reno
IIIrd corps: Wright
Cavalry: Sheridan
Total: ~30,000
AotJames: Hooker
IXth corps: Burnside
IInd corps: Humphreys
XVIIIth corps: Porter
Total: ~45,000
West:
AotCumberland: Thomas
IVth corps: Logan
XIVth corps: Howard
XVIth corps: Rosecrans
XVIIth corps: Sickles (why not?)
Cavalry: Wilson
Total: ~70,000
AotTennessee: Grant
?th corps: Sherman
?th corps: Lew Wallace
?th corps: Newton
?th corps: I'm bound to be missing someone good here...
Cavalry: Torbert/that other good guy...(darn it, what's his name?!?)
Total: ~60,000
Administrator in Washington: McClellan
Confederacy:
East:
AoNV: Lee (duh)
Ist corps: Longstreet
Divisions: McLaws, Pickett, R. H. Anderson, Mahone, Walker, D. R. Jones,
IInd corps: Jackson
Divisions: Ewell, Colston, Rhodes, J. Johnston, Taliaferro
IIIrd corps: A. P. Hill
Divisions: Wilcox, Pender, Heth, Trimble, J. R. Jones
Cavalry: JEB Stuart
Total: ~75,000
Valley Army: Gordon
Divisions: Early, Breckenridge, Hayes, (forgotten person)
Cavalry: Hampton
Total: ~20,000
Army at Richmond: D. H. Hill
Supported by Cavalry, various of the younger Lees
Total: ~30,000
West:
AotTennessee: A. S. Johnston
Ist corps: Hood
IInd corps: Hardee (oh, let's be kind and give Bragg a division here...)
IIIrd corps: Crittenden
Cavalry: 2 competing forces under Hunt and Forrest
Total: ~50,000
Army farther west: J. E. Johnston
Ist corps (and advisor): PGT Beauregard
IInd corps: Pemberton
IIIrd corps: I don't know
, oh wait......Kirby Smith??
Cavalry: there was that other good dude...Morgan?
Total: ~35,000
Man, that's a long list.
And as for specifics, I have no idea what happens, it depends on exactly where everyone is and at what time (this would be an AWESOME ASB thread, making it a massive competition).