Having looked at his record, I find that Edgar Cox attested for his Territorial unit as a Gunner, but was soon referred to as Trumpeter, which he remained until demobilised in 1919.
He received the 1915 Star, plus the British War and Victory medals.
There should be a war diary for his Artillery Brigade, but I am not able to describe how to get a copy, free from Ancestry, or for about £3.50 from the National Archives.
More about researching WW1 soldiers and their units can be found on the Long, Long Trail website.
