The limit and results of the second battle of the Somme had been defined when the Australians, New Zealanders, Second Canadians, and fresh British divisions took the place of their exhausted comrades towards the end of March. The German reserves, great as they were, were nearly exhausted, and they had no more men to put into the fight. The final line began to clearly define itself, running from a few miles east of Arras where the Seventh and Sixth Corps had struck back so heavily at the German pursuit, through Neuville Vitasse, Boyelles, Ayette, Bucquoy, Hebuterne, Auchonvillers, Aveluy, just west of Albert, Denancourt, Warfusee, and Marcelcave. The worst storm was over, but even as the sinking sea will still send up one great wave which sweeps the deck, so the German battle front would break from time to time into a spasm of energy, which could effect no great purpose and yet would lead to a considerable local engagement. These episodes must at least be indicated in the order of their occurrence. {205} One great centre of activity was the ruined town of Albert, for the Germans were able to use it as a covered approach, and thus mass their troops and attempt to break through to the westward. The order of divisions in this sector showed that the Sixty-third and Forty-seventh, still fighting in spite of their wounds, were to the immediate north-west. The Twelfth Division was due west. South-west was the Third Division of Australians and south of these the Fourth. On each of these, and sometimes upon all of them, the strain was very great, as the Germans struggled convulsively to burst the bonds of Albert. It should be noted that the Fifth Army had for the time passed out of being, and that all the southern end of the line was now held by the Fourth Army under General Rawlinson. [Sidenote: April 4.] The main attack upon the Albert sector was on April 4, when the Germans made a violent effort, and the affair reached the proportions of a considerable battle. About eight in the morning the action began by a severe and sudden attack upon the Australian Division 1000 yards south of Albert, and also on the railway near Denancourt. The Australians fought as Australians have always fought in this war, but the onset was very heavy, supported by a shattering fire, and they were forced to yield some ground. [Sidenote: April 5.]