Quote Originally Posted by atheotes
Actually it is a little finicky... sometimes even after i make sure that i have selected the computer to control my second army (when there is no general in command, usually a garrison army), they still come out as reinforcements one by one depending on the number of units in my main stack...
I have also seen the reverse (General in command of second army and i choose to control the army as reinformcements) happen.
If you dont control the army yourself, it will enter as a whole. If you control it, its dependent on how many units you got.