A bastion is a structure projecting outward from the main enclosure of a fortification, situated in both corners of a straight wall (termed curtain), with the shape of a sharp point, facilitating active defense against assaulting troops. It allows the defenders of the fort to cover adjacent bastions and curtains with defensive fire.
The bastion was designed to offer a full range on which to attack oncoming troops. Previous fortifications were of little use within a certain range. The bastion solved this problem. By using a cannon to cover the curtain side of the wall, the forward cannon could concentrate on oncoming targets.
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