The 31st Battalion was raised as part of the 8th Brigade at Enoggera, on the outskirts of Brisbane, in August 1915. Some of
the battalion's companies, however, were also raised at Broadmeadows Camp in Victoria. In early October, these two elements were united at Broadmeadows, and the battalion sailed from Melbourne the following month.
The 8th Brigade joined the newly raised 5th Australian Division in Egypt, and proceeded to France, destined for the Western Front, in June 1916. The 31st Battalion fought its first major battle at Fromelles on 19 July 1916, having only entered the front-line trenches 3 days previously. The attack was a disastrous introduction to battle for the 31st - it suffered 572 casualties, over half of its strength. Although it still spent periods in the front line, the 31st played no major offensive role for the rest of the year.
Source: Australian War Memorial