Basic Details Surname Jefferson Forenames Harold Gender Male Information stated on memorial War First World War (1914-1918) Served or died Died Primary Service As stated on memorial Service (Primary - Stated) British Army Unit (Primary - Stated) Duke of Wellingtons Sub-unit (Primary - Stated) 10th Our References Service (Primary - Our reference) British Army Unit (Primary - Our reference) The Duke of Wellington's (West Riding Regiment) Death and Burial details Year of death 1917 Month of death September Day of death 21 Manner of death as stated Killed Manner of death reference Killed in Action