Tanks in World War I
The continued need for four men to drive the tank was solved with the Mark V which used Wilson's epicyclic gearing in 1918. Also in 1918 the French produced the Renault FT, the result of a co-operation between Estienne and Louis Renault. As mentioned before, it had the innovative turret position, and was operated by two men. At just 8 tons it was half the weight of the Medium A "Whippet" but the version with the cannon had more firepower. It was conceived for mass production, and the FT became the most produced tank of World War I by a wide margin, with over 3,000 delivered to the French Army. Large numbers were used by the Americans and several were also lent to the British.
PT-91 Twardy
A typical Polish PT-91 tank battalion equipped with 53 tanks is composed of 4 frontline companies with 13 vehicles in each and 1 tank for the battalion commander. Every company of 13 tanks is composed of three platoons with 4 tanks in each and 1 tank for the company commander.