A light class ground unit that is extremely effective against other light class ground units. Use this unit to occupy countries when they are out of harm's way.
A medium class ground unit that is highly effective against light class units. Its increased movement points make it ideal to capture countries, and it's also extremely useful as a starting unit in combat.
A medium class ground unit that is highly effective against buildings and other medium class ground units. The increased movement points of this unit make it ideal to blitz with.