Rubber sheeting covered the commander's cupola, the mantlet and the hull machine-gun, but this could be blown away from inside the vehicle by means of an electrical detonator.
The preparation of mantlets, movable shelters, and various implements of war, will take up three whole months; and the piling up of mounds over against the walls will take three months more.
甲，指挥圆
。
身机枪
轒輼，具器
，三月而后
，
，又三月而后已。
