World War 1 tanks were the first in history, great machines armed with cannons and machine guns, and designed to plow through barbed wire and trenches. The British realized that they'd need new technology to break the stalemate, and began the "Landship Project" to develop the equivalent of a ship to operate on land. They deployed the first tank, the Mark I, in September, 1916, and the world was forever changed.
In practice, tanks of the First World War didn't work exactly the way they were meant to, with the machines being slow, prone to breakdowns, and most importantly, often deadly to their crews. Armored commanders didn't understand how best to deploy them, and those Mark I's were used piecemeal, giving Germany time to adapt, develop tank-killing weapons, and eventually their own tanks.
By the time the war ended, thousands of tanks had been built, and both sides were developing faster and heavier models that would have been instrumental in breaking the stalemate on the Western Front.
Here's your chance to rank the most powerful and important WW1 tanks.