William was educated at at Pontywaun County School, at Intermediate School, Risca; at University College of Wales, Cardiff; and at the University College Hospital, London. He took the degrees of M.R.C.S. and L.R.C.P in 1916, but in the meantime had joined the University of London Officer’s Training Corps in October 1914. As soon as he gained his qualifications, he immediately obtained a commission in the R.A.M.C. and was gazetted as Lieutenant in March 1916. After a short period of training on Salisbury Plain, he went to France in May, 1916 attached to the 2/1st South Midland Field Ambulance, from which he was later transferred to the Gloucester Regiment. He become Captain after one year’s service. William was killed in the St Julien sector by the explosion of a shell which wrecked his dug-out while he was in the act of ministering to the wounded. Captain Lander, R.A.M.C., an intimate friend and medical colleague wrote: “He was of a most generous disposition, always cheerful and warn-hearted..... At his medical work he was keen and upto-date.... I think it might be said without exaggeration that he was on of the most, if not the most, popular medical officers in the division.... It was my privilege to visit him at the advanced aid-post, where he received his mortal wound. He was quite calmly doing his duty there, rendering to the wounded the aid they required right in the forward line. I still have a note which he wrote on the day of his death, saying what a rough time he was having and how he had decided to ‘stick it out’ and not come back to a less exposed position.” William was the only son of the Rev William Evans, Baptist Minister of Tegfryn, Risca, co Monmouth, and Zillah - daughter of Joshua Jones.