The Model 1897 was issued to American soldiers during the
Philippine–American War of 1899. This first major use of issued shotguns by the United States military involved 200 weapons procured and sent to the Philippines in 1900. They were employed in countering
Moro tribesmen who engaged the Americans in close-quarter combat using knives and swords. (
See: juramentado) During the
punitive expedition in Mexico, some US soldiers were also equipped with M97s. When the United States entered World War I, there was a need for more service weapons to be issued to the troops. It became clear to the United States just how brutal
trench warfare was, and how great the need was for a large amount of close-range firepower while fighting in a
trench, after they had observed the war for the first three years. The Model 1897 Trench grade was an evolution of this idea. The pre-existing Winchester Model 1897 was modified by adding a perforated steel
heat shield over the barrel which kept the soldier's hands off a hot barrel, and an adapter with
bayonet lug for affixing an
M1917 bayonet. This model was ideal for close combat and was efficient in trench warfare due to its 20-inch cylinder bore barrel. Buckshot ammunition was issued with the trench grade during the war. Each round of this ammunition contained nine 00 (.33-caliber) buckshot pellets. This gave considerable firepower to the individual soldier by each round that was fired. It has been said that American soldiers who were skilled at
trap shooting were armed with these guns and stationed where they could fire at enemy hand grenades in midair. Unlike most modern
pump-action shotguns, the Winchester Model 1897 (versions of which were type classified as the Model 97 or M97 for short) fired each time the action closed with the trigger depressed (that is, it lacks a
trigger disconnector). Coupled with its five-shot capacity, this characteristic allowed troops to fire the whole magazine with great speed by simply keeping the trigger held and running the action as quickly as possible, known as "
slam-firing". This made it extremely effective in close combat, such that troops referred to it as the "trench-sweeper" or "trench broom". Shortly before the end of the war, the German government protested the use of shotguns in combat, claiming it to cause unnecessary suffering. The Model 1897 was used again in World War II by the
United States Army and
Marine Corps, where it was used alongside the similarly militarized version of the hammerless
Model 1912. Some were still in service during the
Korean War and the
Vietnam War.
World War I protests The Winchester Model 1897 shotgun was widely used by American forces during World War I, particularly in trench warfare. Its effectiveness in close-quarters combat led to a formal protest by the German government on 19 September 1918. Germany claimed that the use of shotguns violated the laws of war, specifically citing Article 23(e) of the 1907 Hague Convention, which prohibits weapons causing unnecessary suffering. The protest threatened that any U.S. soldier captured with a shotgun or its ammunition would be subject to execution. In response, the U.S. government, through Secretary of State Robert Lansing and Acting Judge Advocate General Brigadier General Samuel T. Ansell, rejected the German protest. They argued that the shotgun was a lawful weapon of war, comparable to other accepted weapons like shrapnel shells and machine guns. The U.S. warned that any execution of American prisoners would result in reprisals. Despite the controversy, there are no known instances of German forces executing American soldiers for possessing shotguns. However, the U.S. military reportedly censored photographs of trench guns in combat to avoid further diplomatic issues and to prevent negative perceptions among Allied nations. During the First World War, both the French and British high commands evaluated shotguns for trench warfare but declined to adopt them, chiefly because ammunition performance was unreliable in damp conditions and reload rates were slower than those of rifles. ==Other uses==