Army M-3 Knife of WWII
- cgjj2021
- Aug 2, 2023
- 2 min read

The M3 Fighting Knife, commonly known as the M3 Trench Knife, is a distinctive combat knife that played a significant role during World War II. Its history is intertwined with the United States military's quest to equip its soldiers with an effective close combat weapon during the war.
In the early 1940s, as the United States entered World War II, there was a need for a reliable and cost-effective combat knife for the military. The U.S. Army Ordnance Department initiated a program to develop a new knife design that could replace the standard-issue M1917 and M1918 trench knives used during World War I.
The design of the M3 knife was based on the combat experiences and feedback from frontline troops during World War I. Colonel John M. Davis, an ordnance officer and an experienced military fighter, was instrumental in the development of the M3 knife. He sought to create a knife that was effective for both combat and utility purposes while being relatively easy and inexpensive to manufacture.
The M3 Fighting Knife was officially adopted by the U.S. military in March 1943. It featured a 6.75-inch spear-point blade made of carbon steel, a stacked leather handle, and a steel crossguard. The M3 knife was designed to be used in a thrusting motion, which was considered more effective and easier to train than slashing techniques.
The M3 Trench Knife was primarily issued to soldiers in the U.S. Army, especially those in the infantry and other frontline combat units. It was intended to be a versatile tool for close-quarters combat, such as trench warfare and hand-to-hand combat. Additionally, the M3 knife was also used for utility purposes, including cutting ropes and other materials.
During World War II, the M3 Fighting Knife saw extensive use in both the European and Pacific theaters. Its effectiveness and practicality in combat situations were well-received by the troops. However, as the war progressed, the M3 knife faced some criticisms regarding its durability and the retention of its leather handle.
To address these concerns, the design was improved, resulting in the M4 Bayonet, which featured a sturdy molded plastic handle. The M4 Bayonet served as both a bayonet and a fighting knife, offering greater versatility to soldiers.
After World War II, the use of the M3 Trench Knife declined as bayonets and other modern combat knives became more prevalent. Nevertheless, the M3 remains an iconic symbol of the U.S. military's efforts to equip its soldiers with a reliable close combat weapon during one of the most significant conflicts in history. Today, the M3 Fighting Knife is appreciated by collectors and enthusiasts as a reminder of the courage and sacrifice of the soldiers who wielded it in defense of freedom.
I purchased mine from Boker knife company which was one of the companies contracted to make these knives during the war.
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