He left England on the 30th July 1915 when the 6th Battalion were posted overseas and served continually on the Western Front in both Belgium and France. On the 15th July 1916, St. Swithen’s Day, the Battalion were involved on an assault on the village of Pozieres by the 112th Brigade from trenches South of Contalmaison, during the Somme offensive. The attack was headed by the 8th East Lancashire Regiment and supported by the both the 6th Bedfordshire Regiment and the 11th Warwickshire Regiment. Initially, the advance went unopposed but as the two forward battalions went over the crest of a point known as the Chalk Pitt they were held up by heavy and accurate machine gun fire. The Bedford’s were forced to dig in about 100 yards from Liniere. Later, it was found that their attack had failed and they had suffered terrible casualties with 3 Officers and 32 Other Ranks being killed and 25 Other Ranks Missing. A further 9 Officers and 174 Other Ranks were wounded during the assault. His younger brother, Cuthbert, was killed in the Somme sector a few months later and both their names also appear on the Walkern village war memorial. Gilbert is buried in the Pozieres British Cemetery, Ovillers-la-Boisselle, France.