The Hertfordshire Regiment was a territorial infantry regiment of the British Army. Originating in units of Rifle Volunteers formed in 1859, the regiment served in the Second Anglo-Boer War and the First and Second World Wars before losing its separate identity in 1961

1/1st Battalion - On the outbreak of war, the battalion was embodied at Hertford under the command of Lieutenant Colonel Brand. It joined the British Expeditionary Force in France on 6 November 1914, serving in the trenches during the closing stages of the First Ypres. Later that month the battalion joined the 4th (Guards) Brigade of the 2nd Division. Due to this attachment, it acquired the nickname the Hertfordshire Guards

3/1st Battalion - The battalion formed at Hertford in December 1914, moving to Halton Park by October 1915. Re-titled ‘1st Reserve battalion’. On 11 July 1917 it amalgamated with 5th Reserve battalion, the Bedfordshire Regiment.