Alan
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1. The answer has already been given.
2. Hold down the Shift key, and click on the unit and the location where you want to split it.
3. Not possible.
4. Not possible.
P.S. Did I miss something about the Airborne troops, or did you just decide that everyone would play as Barbarians? I'm asking because I hate that race... and how long did it take you to generate the save file so that the second hero wasn't a Barbarian? 8))
Тьма - это то, что позволяет смертным не забывать, как ярок бывает свет.