 Complete the following phrase:  7th Brigade is a combined arms formation or brigade of the Australian Army. The brigade was first raised in 1912 as a Militia formation, although it was re-formed as part of the First Australian Imperial Force in early 1915 for service during World War I. It subsequently saw action at Gallipoli and on the Western Front during the war. Following the end of the war the brigade was disbanded in 1919 before being re-raised in 1921 as part of the Citizens Force later known as the Militia. During World War II the brigade took part in the fighting against the Japanese in New Guinea and on 