Lt.-Col. Neville Sneyd Bertie-Clay (22 July 1864 – 17 October 1938) was a British army officer. He served in the Royal Artillery and in the Royal Garrison Artillery, but spent much of his career on secondment to the Indian Ordnance Department of the Indian Army. Bertie-Clay invented the dum dum soft-pointed bullet in 1896 as the Mark II Lee-Metford bullet then in use was perceived to leave a small wound with insufficient stopping power to halt a determined charge. The dum dum would later be outlawed for use in warfare by the Hague Convention of 1899 but remains in use for police firearms and hunting. Army career Bertie-Clay was born in Chhindwara to Maj.-Gen. Edward Bertie Clay of the Bengal Staff Corps and Sarah Maria (née Attwood). His great-grandfather was Rear Admiral Edward Sneyd Clay (1768–1846). He served as an officer in the British Army from at least 6 June 1887 when, as a Lieutenant in the Royal Artillery, he was seconded to the Indian Ordnance Department of the Indian Army. He was promoted to the rank of Captain on 18 May 1892 whilst still on secondment, this promotion being later postponed to 25 May. Bertie-Clay received promotion to Major on 21 December 1901, remaining with the Indian Ordnance Department. By this point he had transferred to the Royal Garrison Artillery (RGA) which had been formed in 1899 as a sub-branch of the Royal Artillery to manage the heavy guns. Bertie-Clay was promoted to the rank of Lieutenant-Colonel on 18 May 1912, remaining with both the Ordnance Department and the RGA. During the First World War, on 21 June 1917, Bertie-Clay was put on a "Special Appointment", receiving pay equivalent to a Staff Lieutenant (1st class) whilst doing so. His special appointment pay was upgraded to "Class GG" on 23 November 1918 and he relinquished both the appointment and pay on 24 July 1919. Bertie-Clay was awarded the French Croix de Guerre on 21 August 1919 at which point he had returned to the RGA and was once again seconded to the Indian Ordnance Department. Bertie-Clay died on 17 October 1938, having lived for some time at Villa La Pensée in Papara, Tahiti, Society Islands. Dum dum bullet Bertie-Clay is most famous for being the inventor of the dum dum, a soft-pointed bullet. At the time of their invention in 1896 Bertie-Clay was the Superintendent of the British arsenal at