 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 