My research (includes the British Army WW1 Service Records 1914 - 1920) into my paternal Great Grandfather's life (Henry Chetwynd 1866? - 1948), has revealed that he served in the Army Service Corps > No.1 Company > 5th Division Train. His rank was stated as; Driver Enlisted 15th June 1914 and embarked to France 3rd September 1915. Transferred to AR Class 'P' on 14th June 1918 before being discharged on 14th December 1918, (King's Regulations; 392 XV1a) However, I cannot find any specific information or details on this ASC Company / Division or their specific role in WW1, what would his service have included? Any help or guidance would be greatly appreciated.