Acting Sergeant Wilton Campbell Gamack was a 20 year old Clerk in the office of the Railway Department, Sydney. He was known to be a good athlete and a footballer. He was the third son of Mr and Mrs J. Gamack. His brothers were Bruce Gamack, Ranford Gamack and Alexander Gamack. His brothers Bruce and Alexander were both soldiers. Bruce was killed in action while Alexander returned home. The Gamack brothers were raised and educated in Parramatta and lived at Sorrell Street, Parramatta. They were the grandsons of Dr. Gamack, a Government medical officer formerly in Parramatta.

He enlisted on 19 April 1915 and embarked from Sydney aboard the HMAT Runic A54 on 20 January 1916. He was taken on strength in Estaples on 5 April 1916, before being taken on strength in France on 13 May 1916. He was initially appointed the rank of Acting Sergeant, but relinquished the rank upon joining the 19 Battalion on 13 May 1916. On 26 May 1916 he was wounded in action, but remained on duty in the field. He was admitted to hospital with scabies on three occasions, on 21 June 1916, 23 September 1916 and 25 October 1916. His rank changed on several occasions throughout December 1916 and the first few months of 1917. He was promoted to acting corporal on 29 December 1916 before being promoted to acting sergeant on 4 January 1917. He reverted to acting corporal on 21 March 1917, before reverting to private on 21 March 1917. On 1 April 1917 he once again become an acting corporal, before reverting to private again on 19 April 1917.

He returned to England on leave on 10 August 1917. He rejoined his battalion from leave in France on 27 August 1917. On 6 November 1917 he was reported missing in action in France. He was later confirmed to have been killed in action on 6 November 1917 at the age of 22. Witnesses reported seeing him killed whilst leading a pack mule carrying ammunition to the trenches, when a shell burst near him and killed both Private Gamack and the mule. His remains could not be retrieved, and so his name was inscribed on the Memorial Arch erected at Menin Gate, Ypres, in commemoration of those who fell in Belgium and have no graves.

His name is also displayed in the Commemorative area of the Australian War Memorial.

Neera Sahni, Research Services Leader, City of Parramatta, Parramatta Heritage Centre, 2018