Enlisted at Hertford formerly 11656 Bedfordshire Regiment.
10th Battalion was sent to France on July 26th 1915, to Fleselles via Boulogne. In 1916 they fought at many of the Somme battles including, Albert, Trones Wood, Delville Wood and Thiepval Ridge.
In 1917 they were in action at the Ancre, and the Battle for Scarpe. They were then transferred to Flanders where they saw action at Pilkem Ridge, Langemarck and Passchendaele. The following year the Battalion fought at St Quentin, Amiens, and Bapaume and on the Hindenburg Line where, at the end of September at St Quentin canal, Sydney was killed in action.