sentences:  After his grandfather's death in 1890, his grandmother remarried to Spencer Cavendish, 8th Duke of Devonshire.Lord Acheson was commissioned in the Coldstream Guards, and promoted to lieutenant on 19 December 1901, but resigned in late October 1902. after serving in the Boer War from 1899 to 1901.He served as Military Governor of Kimberley, South Africa from 1900 to 1901 and in the First world war as a Lt. Col. in the Coldstream Guards.