World War I Victoria Cross Recipient. Gaby was born and educated at Scottsdale, Tasmania. He then worked on the family farm and during this period he served for three years with the 12th Infantry Battalion (Launceston Regiment) in the part time Citizen Military Forces. At the outbreak of the First World War, he was working as a labourer at Katanning, Western Australia. Gaby enlisted in the Australian Imperial Force on January 16, 1916. He was allotted service number 4053 and after training at Blackboy Hill Camp, Western Australia, he was posted as a reinforcement of the 28th Battalion. He embarked from Fremantle, Western Australia, on HMAT A38 Ulysses on April 1 for training in Egypt. He then was transferred to England for further training before proceeding to join his battalion in France on August 6. He was promoted corporal on October 28 and sergeant on March 13, 1917. On April 7 he was commissioned second lieutenant and promoted lieutenant on September 26. On October 29, he was gassed in Belgium and evacuated to the 3rd London General Hospital, England. He was not fit enough to rejoin the 28th Battalion in France until May 7, 1918. On August 8, the first day of the Battle of Amiens, Gaby was acting D Company commander and showed conspicuous bravery and dash in leading and reorganizing his company when it was held up by barbed wire entanglements. He found a gap in the wire and alone approached an enemy strong point. He then ran along the parapet at point blank range and emptied his revolver into the garrison driving the crews from their guns and forcing the surrender of 50 men with four machine guns. He reorganized his men and led them on to the final objective which was captured and consolidated. Three days later while encouraging his men in the face of heavy enemy fire he was killed by an enemy sniper. He was awarded the Victoria Cross posthumously.