Quote image editor
“That stairway would be a narrow spiral, set to the left-hand side and twisting the right as it ascended. In that way, a right-handed swordsman climbing the stairs would be at a disadvantage to a right-handed defender. An attacker would have to expose all of his body in order to use his sword, while the defender could strike with only his right side exposed. It was standard design for the castle tower.” — John Flanagan
That stairway would be a narrow spiral, set to the left-hand side and twisting the right as it ascended. In that way, a right-handed swordsman climbing the stairs would be at a disadvantage to a right-handed defender. An attacker would have to expose all of his body in order to use his sword, while the defender could strike with only his right side exposed. It was standard design for the castle tower.