A question about replacements in an ACW Campaign Game

[Steel God]

Sorry but even in the recent updates there is nothing in the Users Manual or the Main Help that describes this, something that should be corrected in any future updates.  However I can tell you from 15 years of playing the series that losses are carried over from one battle to the next and that depending on the time span between battles some losses may be replaced, this simulating replacements for the rebel units and men returning to duty for any number of reasons for the yanks.

If you look in the Campaign Editor Help under Campaign Data you will see the following
Losses from one situation are carried over to the next with some losses being replaced depending on the length of time between the battles.

Much appreciated.

Any insight on destroyed units?  Are they gone for good, or returned in some awful small size?