The Wilderness - Numbers for Union brigades/regiments involved

Hannover

Private
Joined
Jan 30, 2020
VI Corps ARTILLERY BRIGADE
Col. CHARLES H. TOMPKINS​

Maine Light, 4th Battery (D), 6 x 3” Rifles
Lt. Melville C. Kimball.

Massachusetts Light, 1st Battery (A), 6 x 12pdr Napoleons
Capt. William H. McCartney.

New York Light, 1st Battery, 6 x 3” Rifles
Capt. Andrew Cowan.

New York Light, 3rd Battery, 6 x 12pdr Napoleons
Capt. William A. Harn.

1st Rhode Island Light. Battery C, 6 x 10pdr Parrotts
Capt. Richard Waterman.

1st Rhode Island Light, Battery E, 6 x 12pdr Napoleons
Capt. William B. Rhodes.

1st Rhode Island Light, Battery G, 6 x 3” Rifles
Capt. George W. Adams.

5th United States, Battery M, 6 x 12pdr Napoleons
Capt. James McKnight.

Total 48 artillery pieces
 

Hannover

Private
Joined
Jan 30, 2020
VI Corps Summary

First Division
Estimated Number
Casualties
Casualty Rate %
1st Brigade
2,739​
364​
13.3​
2nd Brigade
1,610​
111​
6.9​
3rd Brigade
2,027​
278​
13.7​
4th Brigade
1,088​
275​
25.3​
Total
7,464
1,028
13.8
Second Division
Estimated Number
Casualties
Casualty Rate %
1st Brigade
2,178​
635​
29.2​
2nd Brigade
2,730​
1,269​
46.5​
3rd Brigade
2,249​
619​
27.5​
4th Brigade
1,937​
468​
24.2​
Total
9,094
2,994
32.9
Third Division
Estimated Number
Casualties
Casualty Rate %
1st Brigade
2,793​
72​
2.6​
2nd Brigade
3,174​
919​
29.0​
Total
5,967
991
16.6
Artillery Brigade
(22)
Grand Total
22,525
5,013
22.3

pfd equipped: 1,003 officers and 21,581 men = 22,584 men (this is only a 59 difference!)

artillery: 43 officers and 1,536 men

Grand Total for VI Corps = 1.048 officers and 23,165 men

This is only a difference of 59 from the O.R. record. Dare I suggest that this Order of Battle is probably as close as we can reasonably obtain for numbers involved in VI Corps for the battle of the Wilderness, May 4th-8th 1864.
 

Hannover

Private
Joined
Jan 30, 2020
When I started this methodology for determining numbers for the Army of the Potomac at the Wilderness battle, I never for one moment thought that it would produce such a close result to the numbers reported in the O.R. Whilst we cannot still be certain about these values and will perhaps never know the actual numbers involved, they probably give us a 'best estimate' and if not the actual values for individual regiments are correct, they definitely give us an insight into the relative number of combatants in each of the brigades and divisions of the Union Army fighting between 4th May and 7th May 1864 in the Wilderness.
 

Hannover

Private
Joined
Jan 30, 2020
Update for V Corps
FIRST DIVISION: Brig. Gen. CHARLES GRIFFIN
First Brigade: Brig. Gen. ROMEYN B. AYRES
The numbers I used for U.S. Regulars came from James Arnold's 'Armies of U.S. Grant' p.183 but contained no reference. The two Pennsylvania regiments were estimated and the two New York regiments were from Rhea, however there was no reference for the numbers, however I have found the same number (529) used by Trudeau in 'Bloody Roads South' for 140th New York.
I now have a copy of the Return for Ayres’ brigade dated April 30th, 1864. It makes for interesting reading. The numbers quoted are:
140th New York: [627 as opposed to 529, Rhea]
146th New York: [589 as opposed to 556, Rhea]
91st Pennsylvania: [401 compared to 304 est]
155th Pennsylvania: [488 compared to 389 est]
2nd United States [173 as opposed to 191, Arnold]
11th United States [277 as opposed to 200, Arnold]
12th United States [394 as opposed to 450 combined, Arnold]
14th United States [448 as opposed to 530, Arnold]
17th United States [242 as opposed to 690 combined, Arnold]

Where did the 529 come from for 140th New York? Did Rhea just repeat Trudeau's figure?
Where have the figures quoted by Arnold come from?
The estimates are a little on the low side but this may partly be due to the difference between pfd figure and the estimate which is more likely to be closer to effective or engaged strength. The greatest discrepancy though is for the U.S. regiments with a difference near to 500. They both cannot be correct so I have considered the combined frontages when in combat.
Priest has Ayres brigade advance in three lines:
First line frontage of 260 yards consisting of 140th NY and 11th U.S. which totals 627 + 277 = 904 i.e. 3.5 men/yard
Second line frontage of 400 yards: 12th US, 14th US, 2nd US, 17th US = 394 + 448 + 173 + 242 = 1,257 i.e. 3.1 men/yard
Third line frontage of 470 yards: 146th NY, 155th Penn, 91st Penn = 589 + 488 + 401 = 1,478 i.e. 3.1 men/yard
These seem reasonable figures so I think the 30th April return is the more reliable.
The overall impact though is quite small as the new total for the brigade is only 200 lower but this actually moves the total for the Corps closer to the number reported as pfd equipped.

Total for V Corps, First Division, 1st Brigade is now 3,639
The new casualty figures are:

First Division
Estimated Number
Casualties
Casualty Rate %
1st Brigade
3,639​
936​
25.7​
2nd Brigade
2,086​
301​
14.4​
3rd Brigade
2,605​
511​
19.6​
Total
8,330
1,748
21.0
The overall number for the V Corps falls by 200 to 24,367 which is now only 242 difference with the number for pfd equipped.
The casualty rate goes up slightly to 21.6%.
 
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