Passchendaele before taking part in defensive operations during the German spring offensive in early 1918. In April 1918 it was involved in the Allied counterattack at the First Battle of Villers-Bretonneux. This was followed by the Second Battle of Morlancourt. The brigade took part in the final offensive of the war, the Hundred Days Offensive. During this time, the 9th Brigade's casualties had been so high, that one of its battalions—the 36th—had to be disbanded in order to reinforce the others. After Jobson, the brigade's other wartime commanders were Charles Rosenthal and Henry Goddard. Following the end of hostilities the brigade was disbanded in 1919. However, while the AIF had been deployed, a separate Citizens Force (later known as the Militia) formation remained in Australia. By 1918, a 9th Brigade had been established within the 2nd Military District, consisting of the 33rd, 34th, 35th and 36th Infantry Battalions. The AIF was formally disbanded in 1921, at which time it was decided to reorganise the Citizens Force to perpetuate the numerical designations of the AIF. Headquartered in Paddington, in Sydney, the brigade was subsequently reorganised after which it consisted of four infantry battalions—the 1st, 19th, 34th and 45th Battalions. It remained part of the 2nd Military District and by 1928 it formed part of the 2nd Infantry Division. At the outset of World War II, the brigade was tasked with the defence of Sydney, and consisted of the 1st, 4th, 17th and 45th Battalions. In April 1941, the brigade was transferred to the 1st Division and later reduced to three infantry battalions: the 1st, 17th and 18th. Following Japan's entry into the war, the brigade was called up for full time service and mobilised at Narellan before moving to Thornleigh, where it covered an area between Manly to Dee Why and Mona Vale. During this time, the brigade's focus was upon construction of defences. Elements of the 8th Brigade relieved them in March 1942, allowing the brigade to commencing training at Wallgrove to adopt a more mobile defensive posture. In late 1942, the brigade was warned out to deploy to Darwin, Northern Territory, but was instead moved to the Illawarra region. Throughout 1943, the numbers of troops retained in New South Wales was reduced as the garrison was moved north, and elements of the Militia were disbanded to return personnel to war essential war industries. Finally, in June 1944, the 9th