The Battle Tank is the heavy unit of the Modern Era. To train this unit, a Battle Tank Factory is required.
This unit upgrades the Tank in basically everything. gaining 15 attack points, 5 defense points, 1 range point and 6 movement points.
The attack and defense bonuses against Fast and Ranged Units are also upgraded by 5 points on each aspect.
Modern Tanks revolutionized warfare. It combines the shooting range of a stationary canon with the mobility of a tank. Additionally the well shielded cabin inside the tank provides a decent defense against infantry.