Huge lengthy logs roll down to crush enemies to death.
Rollinglog, believed to be an assistant tool for the construction of pyramids. It was not until medieval that this log applied to warfare. As usual, most castles or forts were built on mountain or hill, naturally formed slope makes it harsh to conquer the castles. By contraries, offenders would be massivly killed by down rolling logs.
|Walls 5||Metal Casting 4||300||6,000||0||0|