In the winter of 1917-18 dark clouds hovered in the firmament of the Entente. For nearly four years onslaught after onslaught has been made against the German giant, but they failed to bring him to the ground. He had to keep them at bay with one arm that held the defensive shield because his other arm had to be free to wield the sword against his enemies, now in the East and now in the South. But at last these enemies were overcome and his rear was now free for the conflict in the West. Rivers of blood had been shed for the accomplishment of that task; but now the sword was free to combine in battle with the shield on the Western Front. And since the enemy had hitherto failed to break the German defence here, the Germans themselves had now to launch the attack. The enemy feared and trembled before the prospect of this German victory.