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. ... Found on http://en.wikipedia.org/wiki/Cascan
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. ...