[3] He served as ship's surgeon on with the Pacific Steam Navigation Company's mail steamers to South America for two trips, then was appointed house surgeon to Mr. Bickersteth, an early disciple of Joseph Lister, at the Liverpool Royal Infirmary, and became familiar with the use of Thomas splints, for which he became a proselytizer.
Dr. Hayward made several more voyages to various countries as ship's surgeon, including three times to Australia in 1877–1878.
[3] In August 1915 he left with the Australian Army Medical Corps for England with the nominal rank of major, and he was appointed commanding officer of the Harefield Military Hospital, a position which he held for several years.
[3] He was mentioned in despatches in 1917[1] and served with the Army to March 1918, rising to the rank of lieutenant-colonel,[5] and in January 1918 made full colonel, then returned to Australia in February 1918.
[4] He resumed his duties with the hospital and university in 1918, relinquishing his lectureships in 1920 to allow more time for his medical practice.