Chemin de ronde

A chemin de ronde (French, "round path"' or "patrol path"; French pronunciation: [ʃəmɛ̃ də ʁɔ̃d]), also called an allure, alure or, more prosaically, a wall-walk, is a raised protected walkway behind a castle battlement.

[1][2] In early fortifications, high castle walls were difficult to defend from the ground.

The chemin de ronde was devised as a walkway allowing defenders to patrol the tops of ramparts, protected from the outside by the battlements or a parapet, placing them in an advantageous position for shooting or dropping.

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Chemin de ronde on a curtain wall . Access is given to the battlements and shooting slots in the parapet as well as to a tower door.
The chemin de ronde of the Yedikule Fortress , Istanbul , Turkey .