PM preacher, from a farming family at Henshaw near Haltwhistle, Northumberland. Apart from five years at York (1907-1912) he itinerated in the north-east. He was appointed secretary of the PM Centenary Committee in 1906 and was Connexional General Secretary 1919-1924. He was President of the Conference in 1923. He retired to Gateshead in 1930 and died on 17 February 1940. His younger brother William Armstrong (1853-1926) became a local preacher in 1871 and moved to Beverley; and his son, another William Armstrong (1883-1967; e.m. 1909) served mainly in northern circuits.