The 1st Battalion was an infantry battalion of the Australian Army. Although its numerical name was designated during the First World War, the 1st Battalion can trace its lineage back to 1854, when a unit of the Volunteer Rifles was raised in Sydney, New South Wales. This unit has since been redesignated a number of times, but through its links with the units of the colonial NSW defence force, the battalion's history includes services in Sudan and South Africa. During the First World War, the 1st Battalion was raised for overseas service in 1914 as part of the First Australian Imperial Force. Attached to the 1st Brigade, the battalion served in Egypt initially before taking part in the fighting in Gallipoli against the Turks. Later the battalion was sent to the Western Front where it fought in the trenches in France and Belgium as part of the Australian Corps. Following the end of the war the battalion was disbanded in 1919.