It was the world's first modern combined arms demonstration, and it confounded most conventional military wisdom of the day which had foreseen a static protracted stalemate devolving into trench warfare again. The M-1 tank has two main parts: a pivoting gun turret and a tracked hull.At the beginning of WW2, the US watched with keen interest the developments on the continent, but one point, in particular, caused the military brass to sit up and take notice was the importance placed on having a highly mobile mechanized force, with armor to punch through defenses and exploit gains in conjunction with infantry, artillery, and air support. The turret is an armored structure supporting one or more guns - typically a heavy cannon and a couple of machine guns. The hull's job is to transport the top portion of the tank, the turret, from place to place. The hull is the bottom portion of the tank - the track system and an armored body containing the engine and transmission. Additionally, the track has heavy tread that digs into muddy surfaces, and it never goes flat like a tire. A car grips the ground with only the bottom portion of four tires, but a tank grips it with dozens of feet of track. Tracked vehicles can move easily over rough terrain because the track makes contact with a wide area of the ground. The internal combustion engine made tracked military vehicles feasible. Earlier tracked vehicles weren't practical in battle because their steam engines were too cumbersome and unreliable. The tank's wheels ride along the moving track, just like the wheels in a car run along the road.
The tank engine rotates one or more steel sprockets, which move a track made up of hundreds of metal links. Caterpillar tracks work on the same principle as a conveyer belt.
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