A chemin de ronde (French, `round path`` or `patrol path`; ʃəmɛ̃ də ʁɔ̃d)—also called an allure or, more prosaically, a wall-walk—is a raised protected walkway behind a castle battlement. In early fortifications, high castle walls were difficult to defend from the ground. The chemin de ronde was devised as a walkway allowing defen...