The M1917 bayonet

Bayonet

A bayonet is a knife, dagger, sword, or spike-shaped weapon designed to fit in, on, over or underneath the muzzle of a rifle, musket or similar weapon, effectively turning the gun into a spear...

was designed to be used with the US M1917 Enfield .30 caliber

Caliber

In guns including firearms, caliber or calibre is the approximate internal diameter of the barrel in relation to the diameter of the projectile used in it....

 rifle, as well as with the Winchester Model 1897

Winchester Model 1897

The Winchester Model 1897, also known as the Model 97, M97, or Trench Gun, was a pump-action shotgunwith an external hammer and tube magazine manufactured by the Winchester Repeating Arms Company. The Model 1897 was an evolution of the Winchester Model 1893 designed by John Browning. From 1897...

 and M12

Winchester Model 1912

The Winchester Model 1912 is a hammerless slide-action, i.e., pump-action, shotgun with an external tube magazine. Popularly-named the Perfect Repeater at its introduction, it largely set the standard for pump action shotguns over its 51 year high-rate production life...

 trench shotguns

Combat shotgun

A combat shotgun is a shotgun that is intended for use in an offensive role, typically by a military force. The earliest shotguns specifically designed for combat were the trench guns or trench shotguns issued in World War I...

. The blade was 16 inches (40.6 cm) long. It will not fit the M1903 .30 caliber (Springfield) or the M1 .30 caliber (Garand) US service rifles as they have different bayonet ring (barrel) and attachment stud

Bayonet lug

A bayonet lug is a standard feature on most military muskets, rifles, and shotguns, and on some civilian longarms. It is intended for attaching a bayonet, which is typically a long spike or thrusting knife...

 dimensions.
The M1917 bayonet was used first during World War I

World War I

World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

 by American, Canadian and British soldiers in the trenches of the Western Front

Western Front (World War I)

Following the outbreak of World War I in 1914, the German Army opened the Western Front by first invading Luxembourg and Belgium, then gaining military control of important industrial regions in France. The tide of the advance was dramatically turned with the Battle of the Marne...

.