'Operations opposite Polderhoek 27th November to 5th December 1917. For conspicuous gallantry and devotion to duty. At 8pm on 3rd December 1917, during the consolidation of our line near Polderhoek Chateau, there was a gap of unknown territory between two Companies. The enemy kept this gun under continuous fire from machine guns and fixed rifles, and inflicted several casualties on our men who were endeavouring to establish a continuous line. Private Gilbert volunteered his services to find the flanks of the respective companies. This work he carried out with complete disregard for his own safety, and at one time he was almost surrounded by the enemy's patrols. He perservered gallantly at his work and at last discovered the required points. In audition to this gallant work, Private Gilbert took the leader of one section across the danger gap, and showed him the position of the neighbouring troops. This man was awarded the Military Medal for his gallant services at the Battle of Messines, and also distinguished himself by his wonderful bravery in the recent operations east of Ypres.'
Source: London Gazette
Date: 13 March 1918

'Private Gilbert was battalion runner during the attack on Messines Ridge, while the Battalion was holding the position it had captured. He displayed great resource in finding the whereabouts of different commanders in the Field of operations, and carried many messages across the zones swept by enemy's barrage. During the whole time he showed a total disregard for his own personal safety, and his duties were carried out with exceptional cheerfulness. Though suffering from the severest fatigue he carried on most willingly and set an example to all the other runners, although he himself is practically only a boy.'
Source: London Gazette
Date: 16 August 1917