Bitchu Takamatsu-jo Castle was then one of the few hirajiro or numajiro (castles built on the level ground) which were based on swamps, and was suitable for firearms and cavalry operations.
備中高松城は当時数少なかった低湿地を利用した平城（沼城、ぬまじろ）であり、鉄砲・騎馬戦法にも強かった。