Statistics for occurrence #1 of “General McClellan” in chapter 1.50, section c.1.50.137, page 269 of Southern Historical Society Papers, Volume 24.:
...30,000 men in this encounter.
While General Hill was thus hotly engaged at Boonsborough pass, General McLaws was being pressed at Crampton Gap by General Franklin, in command of the force sent by General McClellan to overwhelm him and prevent his rejoining General Lee.
The commands engaged in these encounters with the enemy were, of course, seriously reduced.
...