In early 1918, the capitulation of Tsarist Russia allowed the Germans to concentrate their strength on the Western Front, and they subsequently launched a major offensive in March. As the Allies were forced back, the 9th Battalion undertook a defensive role until the German onslaught was blunted. In August, the Allies launched their own offensive, which ultimately ended the war. In August, the 9th fought around Amiens. It remained in the line until September when the Australian Corps, having suffered heavy casualties throughout 1918, was withdrawn for rest and reorganisation. They took no further part in the fighting before the armistice was signed in November 1918. After the conclusion of hostilities, the demobilisation process began and the battalion's strength slowly fell as its personnel were repatriated back to Australia. On 5 February 1919, the 9th Battalion was amalgamated with the 10th and subsequently disbanded. Throughout the war, the battalion lost 1,094 killed and 2,422 wounded.