7th/21st Light Horse Regiment (Australia)

The 7th/21st Light Horse Regiment was a mounted infantry regiment of the Australian Army. A part-time unit of the Citizen Force, the regiment was originally formed on 1 October 1936 through the amalgamation of two previously existing Australian Light Horse regiments: the 7th and 21st, both of which were based in the state of New South Wales. This proved only a brief existence as on 1 July 1937, as the Australian Army expanded in response to fears about war in Europe, the two regiments were split again. During the Second World War, these regiments both gave up their horses and mechanised, with the 7th being converting to a motor regiment and the 21st becoming a reconnaissance battalion and then a divisional cavalry regiment; nevertheless, neither served overseas and both were eventually disbanded as surplus to Army requirements in 1943.

In the post war period, the 7th/21st was re-raised in July 1948 as Australia's part-time military force was re-formed following the demobilisation of the wartime military. Raised as a receonnaissance regiment within the 2nd Division, the regiment perpetuated the battle honours that the 7th Light Horse had received for its service during the First World War, and those that had been entrusted to the 21st Light Horse. Upon re-formation in the 1948, the regiment adopted the designation of the the "7th/21st Reconnaissance Regiment", although this was changed the following year to the "7th/21st Australian Horse", perpetuating the territorial designation of the 7th Light Horse. The regiment was disbanded in September 1957, and its personnel were used to re-raise the 4th Infantry Battalion, which later became part of the Royal New South Wales Regiment.