and linked up with the old system, so that upon April 9 all was in order for the assault. The extreme difficulties caused by the formidable defensive preparations of the enemy were fully realised, but everything which human forethought could suggest had been done to meet them. Above all, two great lessons taught by the Somme experience had been thoroughly assimilated; the one that the broader the attack the more successful it is likely to be, as it prevents a concentration of the German guns upon a single area; the other that it is wiser, even in the heat of battle and the glow of victory, to limit your objective to an area which is well within the range of your guns. That last blue line so far forward upon the map has been the cause of many a rebuff. The British bombardment, which came in gusts during the days preceding the attack, did enormous {24} damage to the German defences. The evidence of prisoners showed that for several days they had been reduced to their emergency rations. The wire, which in places was a hundred yards thick, was mostly destroyed in the first line, and greatly damaged in the second, though in the third it was found to be largely intact, save upon the left of the line. The space between the first and second German lines was roughly 500 yards. Between the second and third it was about 3000. The usual forms of bombardment were varied upon April 4 by the use of a large number of Liven's gas projectors, throwing drums of compressed gas, which were seen to burst in the second German line. Fifteen hundred of these were discharged upon the front of a single corps, and they were said to have considerable effect, the reports of prisoners stating that in the suburb of Blangy alone there were 460 casualties from this cause. On April 8 there was a severe gas bombardment from 4-inch trench mortars. Finally, in the early morning of April 9, came the fearful whirlwind of fire which was the prelude to the attack. Some idea of its intensity may be gathered from the fact that the number of guns was so great that they could have rubbed wheels from end to end of the line had they been so placed. At 5.30 the word was given, and in the first dim grey of a rainy, windy, and sleety morning, the infantry dashed forward to the attack--"wave after wave of grimy, mud-covered, determined men, with hearts as hard as steel and as light as feathers," to use the words of one of them. The events may best be described from the south of the line as being the nearest to Arras from which the battle derives its name. {25}