George served with the Royal Engineers (173 Tunnelling Company) assigned to the 19th Battalion Durham Light Infantry. He was one of five brothers, three served in the Army during WW1. Two including George were killed. His brother Joseph Henry Foster (Sapper with 172 Tunnelling Company) was killed 18 April 1915. His brother Matthew Foster served in the Durham Light Infantry and later the 8th Kings own Yorkshire Light Infantry. Matthew survived the conflict.

John Foster