Despite its horrific toll, the battle introduced new tactics, including the first use of tanks. ... The Deadliest Battle of WW1. Posted: February 20, 2025 | Last updated: March 21, 2025.

The Mark I was the first official tank used in battle. It was a 28-ton model with a crew of eight and pair of six pound guns, backed by Hotchkiss 7.62mm machine guns.

The T-34 (pictured), regarded as one of the overall best and most influential tanks of the war, is also the fastest tank of WWII, with a top speed of between 31 and 34 mph (50 to 55 km/h).

On the development of tanks for World War II. Stalin went in for a massive program. And, of course, actually, the Red Army had the largest tank force in the world.