 Complete the following phrase:  In early 1918, the Germans launched a major offensive on the Western Front after the collapse of Tsarist Russia allowed them to concentrate their forces in the west. In late March, as the Allies were pushed back towards the vital Amiens railhead and the situation became desperate, the 40th Battalion was hurried into a defensive position between the Ancre river and the Somme. The battalion subsequently fought during the Battle of the Somme, where they helped hold back the German offensive at Morlancourt. During a three-day battle, the battalion took heavy casualties, losing 225 men, but it struck a significant blow, advancing over and securing a vital position overlooking Amiens. A series of minor actions  dubbed peaceful penetrations  followed as the German advance was blunted. In August and September, after the Allies launched their own 