Like his brother, James, Isaiah Harold Colley also served with the 1st/3rd (North Midland) Field Ambulance in the Royal Army Medical Corps. He was born in Wolverhampton in 1896, so was 4 years old by the time he appeared on the 1901 census with his family at 23 Middle Vauxhall, Tettenhall.
Isaiah was killed on 1 July 1916. However, it appears from the working copies of the Grave Registration Documents on the Commonwealth War Graves Commission site that his body was not immediately identified. Although it has been cross out in pen and his name entered above, the initial typed entry simple has “Unknown (I. H. C. on Respirator)”. He is commemorated at Foncquevillers Military Cemetery in France. He also appears on the Compton Road memorial, the Cable Street Mills memorial, and the Royal Army Medical Corps memorial in St Peter’s Church.