Another missing Federal Major General to be considered:
John Newton
http://en.wikipedia.org/wiki/John_Newton_%28ACW%29
Newton was a division commander in the VI Corps, Army of the Potomac. He was a good defensive general, who is probably most famous for replacing Doubleday as I Corps commander on the field at Gettysburg (who had replaced Reynolds). Newton later ended up in the west commanding a division under Sherman.
I would recommend 3/1/3 and "entrencher" (solid defensive positions at Gettysburg and good last minute entrenchments at The Battle of Peachtree Creek....see wikipedia entry)