df1_2 said:
I dont understand... if I take the GG on a unit, it gives him 20 exp, and I then can afford like 3 uppgrades mayby, and then no more, so I dont understand?
Sounds like confusion between two terms.
You give a unit a PROMOTION when it reaches a new level (at XP=2, 5, 10, 17, etc.). Promotions include Combat I/II/III/IV/V, Shock, Pinch, Medic I/II/II, etc. Some promotions are only available to Warlord units, no matter how many XPs they have. Some promotions are only available to certain unit types, and some unit types get 'free' promotions (e.g. Blitz on tanks/MA).
You UPGRADE a unit when you change its base type. For instance, once you've researched Iron Working, you can upgrade your Warriors to Swordsmen, and you have to pay a fee for each unit you upgrade. If you upgrade a unit with more than 10XP, it drops back down to 10XP, but its level does not change and it keeps all of its promotions. So, if you upgrade a 19XP maceman to a rifleman, it goes back to 10XP, but it won't achieve another level (and thus another promotion) until it hits 26XP.
For a unit that is led by a Warlord, upgrades (a) don't cost any money, and (b) don't drop the unit back to 10XP. So it's much easier to get highly-promoted Warlords, and they can always be of the best unit type available.