An artillery tractor, also referred to as a gun tractor, is a specialized heavy-duty form of tractor unit used to tow artillery pieces of varying weights and calibres. It may be wheeled, tracked, or half-tracked.
There are two main types of artillery tractors, depending on the type of traction: wheeled and tracked.
In addition, half-track tractors were used in the interwar period and in World War II, especially by the Wehrmacht. This type of tractor was mostly discontinued in the postwar.
The first artillery tractors were designed prior to the outbreak of World War I, often based on agricultural machines such as the Holt tractor. Such vehicles allowed the tactical use of heavier guns to supplement the light horse drawn field guns. "Horseless artillery" available prior to World War I weighed 8 tons, had 70 horsepower and could go 8Â mph. For example, in the British Army it allowed the heavy guns of the Royal Garrison Artillery to be used flexibly on the battlefield.
In World War II the draft horse was still the most common source of motive power in many armies. Most nations were economically and industrially unable to fully motorise their forces. One compromise was to produce general purpose vehicles which could be used in the troop transport, logistics and prime mover roles, with heavy artillery tractors to move the heaviest guns.