The 7th (Service) Battalion of the Gloucestershire Regiment was a unit of 'Kitchener's Army' raised immediately after the outbreak of World War I. After a short period of training it fought in the Gallipoli Campaign, distinguishing itself at the Battle of Chunuk Bair. Afterwards it served in Mesopotamia, including the capture of Baghdad. It ended the war with the North Persia Force at Baku on the Caspian Sea.

The Battle of Chunuk Bair was a World War I battle fought between the Ottoman defenders and troops of the British Empire over control of the peak in August 1915. The capture of Chunuk Bair,, the secondary peak of the Sari Bair range, was one of the two objectives of the Battle of Sari Bair.