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.
Horses in World War II
The 1944 Cavalry Corps, in turn, had up to 103 tanks and tank destroyers in addition to three Cavalry Divisions that once again were made lean and light and dependent on horse alone (4,700 men with 76-mm field guns and no armor). By the end of the war with Germany, Soviet cavalry returned to its pre-war nominal strength of seven cavalry corps, or one cavalry corps per each tank army. The CMGs of the period (one Tank Corps and one Cavalry Corps) were regularly weapons of choice in operations where terrain prohibited the use of fully deployed Tank Armies.