The completed vehicle was running by the end of 1915 but by then a new design was under construction and this would become the prototype for all British heavy tanks in the First World War.

Designed to break the stalemate of trench warfare, tanks made their first faltering appearance at the Battle of Flers-Courcelette, 15 September 1916. How did the guns operate? How was the fuel stored?

American industry provided almost two-thirds of all the Allied military equipment produced during the war: 297,000 aircraft, 193,000 artillery pieces, 86,000 tanks ... already the world's largest ...

The completed vehicle was running by the end of 1915 but by then a new design was under construction and this would become the prototype for all British heavy tanks in the First World War.