 Using the combined arms techniques developed earlier at Hamel, the Allies achieved territorial gains that had been unheard of since the start of the war.In the Australian sector, the 4th and 5th Divisions had initially spearheaded the advance, before the 2nd and 3rd Divisions had advanced another three kilometres to secure the secondary objectives.The attack had been so successful that it was later described by German General Erich Ludendorff as a "black day" for the German Army.