 Complete the following phrase:  Matheson joined the Hertfordshire Militia before being commissioned as a second lieutet into the Bedfordshire Regiment on 15 December 1888. On 2 June 1894, Matheson transferred from the Bedfordshires, in which he was then a lieutet, to the Coldstream Guards as a second lieutet again, and was promoted lieutet in that regiment on 1 December 1897. He served in the Second Boer War, as adjutant of the 1st battalion from 1899 until May 1902. The battalion took part in the battles of Belmont 23 November 1899, Enslin, 