A bayonet is a knife, sword, or spike-shaped weapon designed to fit on the end of a rifle's muzzle, allowing it to be used as a spear. From the 17th century to World War I, it was considered the primary weapon for infantry attacks. Today, it's considered an ancillary weapon or a weapon of last resort. Modern bayonets are often multi-purpose knives such as the Soviet AKM bayonet which was also a ground breaking survival knife that can be used as a wire-cutter when combined with its scabbard.