During the Battle of Somme, what happened with most of the Mark I tanks? How many tanks would the British and French produce in WWI?

Many broke down, but nearly a third succeeded in breaking through. Of the forty-nine tanks shipped to the Somme, only thirty-two were able to begin the first attack in which they were used, and only nine made it across "no man's land" to the German lines.

5,800 tanks

The French had planned for a defensive war and built tanks accordingly; infantry tanks were designed to be heavily armoured. Within France and its colonies, roughly 5,800 tanks were available during the time of the German offensive, and some when they came into contact were effective against the German tanks.

The Mark IV was used en masse, about 460 tanks, at the Battle of Cambrai in November 1917. The Mark V, with a much improved transmission, entered service in mid-1918. More than two thousand British heavy tanks were produced.

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