"In fortification, cascans, or cascanes, are holes, or cavities in the form of wells, made in the terreplein, near a rampart; from which a gallery, dug in a similar manner underground, is conveyed, to give air to the enemy's mine."@en . "In fortification, cascans, or cascanes, are holes, or cavities in the form of wells, made in the terreplein, near a rampart; from which a gallery, dug in a similar manner underground, is conveyed, to give air to the enemy's mine."@en . . . . . . "Cascan"@en .