We may not be knowing that the first successful caterpillar type tractor w as patented by Mr Benjamin Holt from USA in 1904. Commercially produced by 1908, the track tractor inspired the development of current day Military Tank to play havoc in the war.
We should also remember that in the war following order of battle is applied -
Capture different targets.
It captures yet more bigger target enroute.
It occupies the territory grabbed by the Artillery and Armour.