Cossacks.
Its a RTS similar to AoE.
Features:
17th and 18th Century Warfare.
16 Different Nations to choose from (Algier, England, France, Spain, Russia, Ukraine to name a few).
You control up to 4000! units

(Age of Empires stops at 200...)
Formations are really important, way more than in AoE.
Effdub