World War I Weapons

The First World War saw a dramatic increase in the firepower available to armies, and the resulting weapons shaped the deadlock of trench warfare on the Western Front. The combination of rapid-firing guns and entrenched defences meant that attacking forces faced enormous casualties, while new weapons were introduced in an effort to break the stalemate.

The most influential weapon was arguably the machine gun, which could sweep no man's land with continuous fire and made massed infantry assaults extremely costly. Heavy artillery dominated the battlefield, with prolonged bombardments intended to destroy defences and support attacks, and the standard infantry weapon remained the bolt-action rifle. Trench mortars were developed to lob shells into nearby enemy trenches at high angles. Poison gas, first used on a large scale during the war, introduced chemical warfare; chlorine, phosgene and later mustard gas caused suffering and forced the adoption of protective masks. Flamethrowers were employed to clear trenches and strongpoints at close range.

In an attempt to overcome trench defences, the tank was introduced as an armoured, tracked vehicle capable of crossing broken ground and crushing barbed wire. Although early tanks were slow and unreliable, they pointed toward the mobile armoured warfare of later conflicts. Aircraft also developed rapidly, moving from reconnaissance to aerial combat and bombing. Together these weapons gave the war its industrial and lethal character.

Frequently asked questions

Why was the machine gun so important in World War I?

It could fire continuously across open ground, making infantry assaults across no man's land extremely costly and contributing to the trench stalemate.

How was poison gas used?

Chemical agents such as chlorine, phosgene and mustard gas were released or fired against enemy troops, causing injury and death and forcing the use of gas masks.

Why were tanks developed?

Tanks were introduced to cross trenches and barbed wire and to break the deadlock of static warfare, though early models were slow and mechanically unreliable.