When you install the game, you should find a "Docs" folder containg pdf versions of various documentation. Mine is located at "C:\Program Files\AGEod's American Civil War\Docs", but the location might vary depending on OS language and whether you have used the default locations or not.
The problem with the manual under docs is it's not up to date. The online wiki is not printer friendly. I was hoping that someone had done a up to date manual that is a doc or pdf. Thanks anyway.