Heavy tank Mk VIII was developed as international project between US and UK (hence its second name 'International') in 1918. Based on Brirish experience in producing of famous series Mk I-V, US Military want to get a tank, superior in power, loading and trench crossing. US provided transmissions and engine to move this monster. 300 hp engine 'Liberty' was designed for the tank, and it bring the name Mk VIII 'Liberty'. The Mk VIII tanks was in US Army service until 1932, and in 1939 Canada bought most these tanks from US for training purposes.