Brigade / Division / Corps Sizes

[tony_gunter]

i notice in many battles, sizes of troops groupings are quite different.

Many Confederate brigades were nearly rhe size of a Federal Division. Confederate divisions were somewhere between a division and a corps. And when battles were large enough to match a Confederate corps vs a Federal corps such as at Chancellorsville, the Confederates enjoyed overwhelming numerical superiority.

What was the origin of the difference in sizes for brigade, division, and corps, and how did this affect the performance of the two sides?

 

[Saphroneth]

I think there may be a definitional issue between "formed" as in, newly created, and "formed" as in, composed of.