Forested areas potentially provide valuable protection against various artillery attacks, due to trees and their foliage blocking the path of shrapnel fragments. Therefore, a unit in defense on a forested area shall receive +3 defense points against all artillery attacks. During cavalry or infantry onslaughts, forested terrain has no modifying impact on assault or defense.
Another effect of areas covered by forest is that even if attacked units are within artillery range, an enemy launching the assault cannot enlist artillery support against the units standing here. This form of defense may be neutralized by a hostile artillery exploratory unit possibly standing nearby.