This fired rapidly, almost without interruption, and was able to kill large numbers of enemy soldiers quickly.

When released into the air, this chemical created an odorless, colorless weapon that caused temporary or permanent blindness, breathing problems, burns, and even death.

These were slow and hard to maneuver, but provided troops with a way to watch enemy movements. Eventually pilots would shoot at each other in the air, engaging in “dogfights."

This became its own weapon of war, even though they were initially used for protection for soldiers. Typically 6 feet deep and between 2 to 3 feet wide. Soldiers would shoot from within these, protected by sandbags on either side.

These could easily run over rough ground, and go over barbed wire. Machine guns and cannon were mounted on them to shoot at enemy forces. Early models were clumsy and slow, but effective.

Cannon-like guns that could fire explosive projectiles long distances. When the shells landed, they exploded, throwing shards of deadly shrapnel in all directions, killing and maiming soldiers near the impact area.

Germans shot torpedoes from these to sink opposition ships, focusing on limiting the amounts of supplies that were shipped to Allied forces.