Ground units includes tanks, artilleries, and working units.
Bulldozer: Warning! you have no more bulldozer.This is the unique contruction unit. It permits to level down an area before a building can be erected. This is also the only device able to capture an enemy headquarter and thus to acquire enemy technology. Keep in mind : bulldozer is a key unit, allways keep a factory operationnal with sufficient resources to produce at least one bulldozer.