Per his military service record (Depot), Gordon Robertson was born at Gordon, Sydney, N.S.W. He gave his age as 18 years and 7 months, his marital status as single, and his occupation as labourer. His description on his Certificate of Medical Examination was 5 feet 5 inches tall, weight 8 stone 10 lbs., with a fresh complexion, blue eyes, and brown hair. His religious denomination was Presbyterian. He claimed that he had no previous military service.
A telegram from his father J. Robertson filed in his service record gave permission for him to join the expeditionary force.
He undertook a preliminary medical examination at Bathurst on 27th October 1915. He was attested by Captain A. C. Eade at Bathurst on 28th October 1915 (the day the Coo-ees marched from Bathampton to Bathurst). He completed his medical examination at Liverpool on 13th November 1915.
After the Coo-ee March he went into Liverpool Camp as reinforcement for the 13th Battalion.
On 21st January 1916 Private Robertson was charged with being absent without leave on 3rd and 12th January 1916. He was fined 10 shillings.
On 16th February 1916 Private Roberston went before a civil court charged with riotous behaviour and malicious damage. He was fined £11/2/6.
The Evening News reported on 16th February 1916 that he had been charged at the Sydney Water Police Court with throwing stones at the German Club, and breaking one of the windows, about 8 o’clock the previous Monday night.
He was discharged services no longer required on 13th March 1916.
 NAA: B2455, ROBERTSON GORDON