Enfield Bayonet 

The 19th century introduced the concept of the sword bayonet, a long-bladed weapon with a single- or double-edged blade that could also be used as a shortsword. Its initial purpose was to ensure that riflemen, when in ranks with musketmen, whose weapons were longer, could form square properly to fend off cavalry attacks, when sword bayonets were fitted. The hilt usually had quillons was modified to accommodate the gun barrel, and a hilt mechanism that enabled the bayonet to be attached to a bayonet lug.