Hi Joan,
There is an Army record for him which will provide some information - main facts are as follows.
Index says he was born c. 1889, joined in 1915 at which time he was living at 68 Canada Street, Shieldfield, Newcastle.
Was in the Army Cycle Corps. Service no. 2350G or
M/427411 in ASCMT.
age 26 years 8 months on 12 December 1916/18? or 16th May 1916
Clothiers Asistant
Height 5ft 6.25 inches
Next of Kin Minnie GILROY 68 Canada Street - wife
Children
Ethel ??

1914
Robert S 13 Feb 1916
Minnie Doris 13 Oct 1917
Full Name Robert Swan GILROY
First Joined 5 Apr 1917
Enlisted 12 Dec 1915
Mob. 5 Apr 1917
Bryan