World War I
The first such devices were designed prior to the outbreak of World War I, often based on agricultural machines such as the Holt tractor. Such tractors 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 8 mph. For example in the British Army it allowed the heavy guns of the Royal Garrison Artillery to be used flexibly on the battlefield.
Read more about this topic: Artillery Tractor
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