In 1905, a Hornsby 20-hp 17-ton tractor was fitted with a chain track. In July 1905 and February 1906, it was demonstrated at Grantham to representatives from the War Office. In August 1906, the 1903 competition-winning tractor was fitted with chain tracks. On testing this vehicle in July 1907, the word "caterpillar" was first used to describe the machine (by British soldiers). In May 1908, this vehicle was demonstrated to King Edward VII and the Prince of Wales at Aldershot, who were introduced to David Roberts.