SIEGE TOWER
A mobile tower that shoots projectiles at any enemy in sight.
An empty siege tower fires no projectiles. Garrison up to 10 units to maximize firepower.
Up to 10 additional units can be garrisoned for protection, but they do not increase firepower.
Countered by Rams and Cavalry Swordsmen.
Available to the Han, Macedonians, Ptolemies, and Seleucids.