During WWI he served on the western front, reached the rank of major in charge of the medical division of a casualty clearing station, and was mentioned in despatches.
[3] In 1919 Hardy was appointed an assistant physician to the Queen Elizabeth Hospital Birmingham.
In 1944 he was the Royal College of Physicians's Croonian Lecturer on Order and disorder in the large intestine.
He described the birth of the Society as taking place at the top of the main staircase of the Athenaeum, where Hurst had collected a group of friends: John Ryle, L. J. Witts, Letheby Tidy, and himself.
Hardy, (William) Trevor Cooke, Clifford Hawkins, and the surgeon Bryan N. Brooke, with the help of the research department of the Dunlop Company in Birmingham, developed and tested their own successful version of the rubber-based ileostomy bag.