 Five infantry divisions of the AIF saw action in France and Belgium , leaving Egypt in March 1916 . I ANZAC Corps subsequently took up positions in a quiet sector south of Armentieres on 7 April 1916 and for the next two and a half years the AIF participated in most of the major battles on the Western Front , earning a formidable reputation . Although spared from the disastrous first day of the Battle of the Somme , within weeks four Australian divisions had been committed . The 5th Division , positioned on the left flank , was the first in action during the Battle of Fromelles on 19 July 1916 , suffering 5 @,@ 533 casualties in a single day . The 1st Division entered the line on 23 July , assaulting Pozieres , and by the time that they were relieved by the 2nd Division on 27 July , they had suffered 5 @,@ 286 casualties . Mouquet Farm was attacked in August , with casualties totalling 6 @,@ 300 men . By the time the AIF was withdrawn from the Somme to reorganise , they had suffered 23 @,@ 000 casualties in just 45 days . 
