Was the cornfield the most bloody section of this battle?
For each of the following locations, what were the respective sizes of attack and defense forces, as well as the casualties on both sides?
Cornfield
Dunker Church
Sunken Road
Burnsides Bridge
I think it's impossible to know how many men fought and became casualties in the actual 24-acre Cornfield, but if "The Cornfield" refers not only to the Cornfield proper, but also to the areas immediately surrounding it, then:
(My source for everything is
The Maryland Campaign of September 1862 by Ezra Carman, unless otherwise noted.)
Strength
Union: 16,292 (1st Corps, and 12th Corps minus Goodrich's brigade)
Confederate: 10,223 (Jackson's division, Hood's division, the brigades of Lawton, Hays, and Trimble from Ewell's division, and the brigades of Ripley, Colquitt, and Garland from D.H. Hill's division)
Total: 26,515
Casualties
Union: 3,695 (Source: McClellan's casualty report)
Confederate: 4,345
Total: 8,040
West Woods (
Dunker Church)
Strength
Union: 9,869 (2nd division [Sedgwick] of 2nd Corps, 2nd division [Greene] of 12th Corps, and Irwin's brigade of 6th Corps)
Confederate: 7,552 (Walker's division minus the 27th North Carolina and 3rd Arkansas, the brigades of Semmes, Barksdale, and Kershaw from McLaws' division, G.T. Anderson's brigade from Jones' division, and Early's brigade from Ewell's division)
Total: 17,421
Casualties
Union: 3,278 (Sedgwick: 2,255; Greene: 650; Irwin: 373) (Source: McClellan's casualty report)
Confederate: 1,947
Total: 5,225
Sunken Road ("
Bloody Lane")
Strength
Union: 10,015 (1st and 3rd divisions [Richardson and French] of 2nd Corps)
Confederate: 7,197 (Cobb's brigade from McLaws' division, the brigades of Rodes and G.B. Anderson from D.H. Hill's division, R.H. Anderson's division minus Armistead's brigade, G.T. Anderson's brigade from Jones' division, the 27th North Carolina, the 3rd Arkansas, and remnants of Colquitt's brigade)
Total: 17,212
Casualties
Union: 2,954 (Source: McClellan's casualty report)
Confederate: 2,574
Total: 5,528
Burnside Bridge
Strength
Union: 5,689 (Sturgis's division, Crook's brigade from the Kanawha division, and the 11th Connecticut)
Confederate: 457 (Toombs' brigade from Jones' division, and the 50th Georgia)
Total: 6,146
Casualties
Union: 500
Confederate: 120
Total: 620
Final Attack
Strength
Union: 12,193 (9th Corps minus the 500 casualties at Burnside Bridge)
Confederate: 5,642 (Jones' division minus G.T. Anderson's brigade and the 120 casualties at Burnside Bridge, Evans' independent brigade, and the brigades of Gregg, Branch, and Archer from A.P. Hill's division)
Total: 17,835
Casualties
Union: 1,793 (Source: McClellan's casualty report)
Confederate: 1,052
Total: 2,845