Prison Deaths and Prisoners.

The number of Confederate prisoners in Northern prisons was 220,000, and the number of Federal prisoners in prisons South was 270,000.

Death rate in Northern prisons12 per cent
Death rate in Southern prisons9 per cent

See the report of Secretary Stanton, made July 9, 1866; also the report of Surgeon General Barnes, United States Army.

Some of the Brigade Losses in Particular Engagements.

GettysburgGarnett's Brigade (Va.)Pickett's Division65.9 per cent
GettysburgPerry's Brigade (Fla.)Anderson's Division65 per cent
AntietamWofford's Brigade (Tex.)Hood's Division64.1 per cent
FranklinCockrell's Brigade (Mo.)French's Division60.2 per cent
ChickamaugaBenning's Brigade (Ga.)Hood's Division56.6 per cent

There are thirteen more brigades with losses, varying in numbers, before the percentage is reduced to forty per cent.

Percentage of Loss in Some Regiments in Single Battles.

GettysburgTwenty-First North Carolina90 per cent
GettysburgFirst Missouri82 per cent
GettysburgTwenty-Sixth North Carolina88.5 per cent
AntietamTwentieth Texas82.3 per cent
AntietamTwelfth Massachusetts67 per cent
AntietamTwenty-First Georgia76 per cent
AntietamOne Hundred and First New York71 per cent

And so on. There are over fifty regiments in the Confederate army before forty per cent is reached. How many there are in the Federal army I do not know. (From "The Confederate Soldier in the Civil War," and other sources.)