The 7th Field Battery has its origins in the Union Troop of Western Australian Mounted Volunteers which was formed on 19 July 1870.

The battery was sent to the Middle East then participated in the Greece and Crete campaigns usually in support of fellow West Australians in the 2/11th Battalion.

In 1942, the battery returned to Australia then served in action throughout the South West Pacific Area.

In 2003, the Battery consisted of a headquarters element, a command post, four 105 mm M2A2 Howitzer detachments and was part of the 13th Brigade.

Following the reorganisation of the Australian Army Reserve's artillery units as part of Plan Beersheba, the battery is now armed with the F2 81mm mortar[3] as its primary weapon platform.