 The battalion 's next engagement came on 26 March 1917 when they undertook an attack on Lagnicourt , during which they lost 11 killed and 29 wounded . The 27th Battalion did not undertake a major engagement until 20 September when they took part in the Battle of Menin Road , which resulted in success for the Australians . During the battle , they were committed to the fighting as part of the first wave which routed the German forces . Advancing under a cover of artillery and machine gun fire , the battalion captured a section of the German line known as the ' Blue Line ' between Polygon Wood and a position known as the Iron Cross Redoubt . Later , they successfully took part in the Battle of Broodseinde on 4 October , which was their last major offensive action in 1917 . 
