Benjamin Holt was a proud industrialist creating tractors and other farming equipment when World War I broke out. While he prided himself on innovation, he stuck to creating better and better farming equipment rather than trying to create arms for the war effort.
But it turns out his farming equipment was actually destined to become one of the greatest innovations of war to emerge from that conflict.
That's because Holt had developed a new tractor design in 1904, the "Caterpillar," which used treads instead of wheels, allowing it to stay above the mud of the San Joaquin River Delta near Sacramento, California.
Holt replaced the steam engines of his original design with gasoline power ones in 1908, and the design took off. When World War I opened, horses butchered in front line fighting were slowly replaced with tractors, including Holt's.
His design was actually a favorite on the front lines because the amazing grip of his caterpillar treads allowed the tractor to operate in heavy mud and to pull itself out of shell craters.
So there was little surprise when the British government placed an order for about 1,000 Holt Caterpillar tractors.
But when those same tractors rolled onto the battlefield, there was plenty of reason for German soldiers to sh-t their pants.
That's because those tractors had undergone the "Mad Max" treatment courtesy of the Royal Navy, who covered them in thick metal plates, packed them with machine guns and cannon, and sent them crawling across the battlefield at a whopping 4 mph.
And that's how the first-ever tank was born.
The British Mark I Tanks, built on the Holt Caterpillar tractor, were custom-made to end the stalemate of trench warfare. Their long bodies and treads allowed them to roll over many trenches and barbed wire obstacles like they weren't there while their guns wiped out enemy defenses and infantry.
Behind them, infantrymen poured through the gaps created by the tanks and quickly seized German trenches and territory.
While the first attack at Flers Courcellette had its issues — mostly that the tanks broke down and were too slow to reposition themselves after the advance to prepare for the German counterattack — their rapid drive toward the objective served as their proof of concept.
British Gen. Douglas Haig, the commander of Allied forces at the Somme, requested hundreds more of the makeshift tanks, and armored warfare quickly became a new standard.
Better French and British tank designs soon followed the Mark 1, but it was an American tractor that carried the first tanks to fight in war.