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Mk 1 (Hand Grenade)

1917 WORLD WAR 1

History

The Mk 1 series fragmentation grenades were issued to the US Army and had a rather short service with the US Army "Doughboy" during the First World War. The type was designed in 1917 and entered service that same year, but only until mid-1918 - the last year of the war.

Although its designers claimed a five-step "foolproof" activation process, the Mk 1 proved too complex to be used in the heat of battle, and had to be redesigned after mass production ceased. It was quickly improved and relaunched as the "Mk 2", but the damage was done.

Nonetheless, the Mk 2 replaced the Mk 1 on American production lines before the end of the war, making the Mk 1 a chapter in military history.

When the United States officially entered World War I on April 6, 1917, it had little local war weapons industry and had to use the materials of the Triple Entente - which included tanks, planes, rifles, machine guns and The most important hand grenades of allies such as France and Great Britain. The grenade proved to be very helpful in repelling enemies with fixed fronts of many kilometers of trenches found in the European countryside. However, great care must be taken to ensure that the grenade operator does not unnecessarily expose himself to enemy fire when throwing or preparing to detonate - or have his grenade returned to him by the enemy, with the intended catastrophic consequences.

The U.S. forces involved in the war initially received "F1" series grenades from France or "Mills Bomb" grenades from British stockpiles. Over time, the need for homegrown grenades became apparent (as well as the national pride in sending troops to war with homegrown American weapons), prompting U.S. authorities to commission research into the design.

In August 1917, engineers in the U.S. Army's Trench Warfare Division responded with the "Mk 1", a grenade similar to the French F1 series. This was followed by a contract for 5,000 units, which eventually soared to 68,000,000 units in a matter of weeks thanks to the U.S.'s enthusiastic and well-organized war effort at home. The order was then filled and the shells were shipped overseas to serviceable American units.

However, after only a short time in the field, in April 1918, American authorities (reported from field experience) conducted a devastating assessment of its Mk 1's capabilities. Apparently, the grenade was "too" designed so that a live grenade could be returned to the launcher due to a complex five-step activation process. In the heat of battle, an American soldier easily completes the partial arming process without much time to think before throwing a grenade - causing the battle-hardened enemy to fully arm the grenade and turn her back to the American attitude. The entire process requires the operator to pull the safety pin, remove the cap from the top of the grenade, provide a lever on the grenade to start the fuze countdown, drop the grenade at a safe distance, and seek shelter in the fragments of the subsequent explosion. The timed friction fuze takes over to Complete the detonation process.

As expected, the production of new grenades was completely halted in order to fully address the problem, and the timing was a bit critical for the U.S. military, which would soon be entering large-scale operations by the direct enemy at this stage of the war.

By August 1, 1918, the redesign was complete and a simpler weapons process was installed. Subsequent production and the armistice of November 11, 1918 had already delivered some 17,447,245 examples, some of which even used parts not used in existing Mk 1 production until the assembly line was retooled for the new design. However, this improved form - the "Mk 2" - came too late to be involved in major combat operations from then on.

In any case, World War I was over, and the Americans had accumulated a wealth of experience in designing and producing their own grenades concepts that evolved into designs spanning more than a century.