in Fortification, are the covered ways by which the besieger tries to draw near a fortification, without exposing his men to the fire of the place. The covered way is formed by excavations advancing obliquely to the fortress, and the earth thrown out of the cut is collected between it and the works of the besieged, as an additional cover to the men; or where the ground is rocky, they are protected by baskets of earth, or bags filled with some soft material. See Fortification.