 Complete the following phrase:  In March 1916, Leak and the rest of his battalion sailed for France and the Western Front. They spent several weeks in a quiet sector of the line near Armentières, before deploying south to the Somme river valley, where they experienced their first fighting in France. On 1July, the Battle of the Somme commenced. This mainly British offensive involved attacks against German trench systems on either side of the Somme. British troops pushed slowly forward towards Bapaume until they were just short of the village of Pozières, at which time the Australian 1st Division entered the fray in the 