 The German offensive ground to a halt in mid @-@ July and a brief lull followed , during which the Australians undertook a series of raids , known as Peaceful Penetrations . The Allies soon launched their own offensive — the Hundred Days Offensive — ultimately ending the war . Beginning on 8 August 1918 the offensive included four Australian divisions striking at Amiens . Using the combined arms techniques developed earlier at Hamel , significant gains were made on what became known as the " Black Day " of the German Army . The offensive continued for four months , and during the Second Battle of the Somme the Australian Corps fought actions at Lihons , Etinehem , Proyart , Chuignes , and Mont St Quentin , before their final engagement of the war on 5 October 1918 at Montbrehain . While these actions were successful , the Australian divisions suffered considerable casualties and by September 1918 the average strength of their infantry battalions was between 300 and 400 , which was less than 50 percent of the authorised strength . The AIF was withdrawn for rest and reorganisation following the engagement at Montbrehain , and was subsequently out of the line when the armistice was declared on 11 November 1918 . Although some artillery units continued to support British and American units into November , and the AFC maintained flying operations until the end of the war . Total Australian casualties on the Western Front numbered 181 @,@ 000 , including 46 @,@ 000 of whom died . Another 114 @,@ 000 men were wounded , 16 @,@ 000 gassed , and approximately 3 @,@ 850 were taken prisoners of war . 
