[1] 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.
[citation needed] 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.
Compared to wheeled vehicles they had better off-road capabilities, but were slower on roads and were more prone to breakdowns.