However, kuruwas of yamajiros built in the middle ages were not suitable for a gun-shooting battle, because once a kuruwa is captured by the enemy, the next kuruwa often comes within the range of the enemy's fire.
しかし、ひとつの曲輪が制圧されると、次の曲輪が射程に入ってしまうことが多く、中世の山城の曲輪は、鉄砲を用いた戦いに向いていなかった。