The Battle of Cambrai had been the last fling of the Allies for the time being. They were now definitely upon the defensive, awaiting a great attack in some uncertainty as to the precise point at which it should be launched. The victories of the Central Powers upon other fronts, above all the collapse of Russia, had freed German troops which, if not for the most part of high quality, would be able to man defences while attack was delivered elsewhere by the superior troops they relieved. Not a week passed without the announcement of the arrival of new divisions from Russia or Italy. Between November the 1st, 1917, and March the 20th, 1918, the number of German divisions in the Western theatre had increased from one hundred and forty-six to one hundred and ninety-two.[49] The total continued to grow for some time after the launching of the offensive. The heavy artillery had also been greatly increased, while a number of Austrian artillery regiments had come to the aid of their allies. The forces of the Allies were now considerably outnumbered, though not nearly to the extent which many writers, then and since, have pretended. Moreover, they were without unity of command, and there was among them divided opinion as to the point at which they would have to meet the onslaught, though Sir Henry Wilson had insisted that it would be at the junction of British and French. There had been preparations for an advance in Flanders. The French had apprehensions of one in Champagne. On both these fronts there came, indeed, great attacks at subsequent dates. Even if the attack were to come, as seemed most probable, on the front of General Gough's Fifth and General Byng's Third Armies, its exact scope was uncertain. The final opinion appeared to be that, while the opening assault would extend further south, the main weight of the attack would be north of the Somme, along which would be formed a defensive flank. There is little doubt, from the writings of German staff officers since published, that such was the original intention, and that only unexpectedly great success south of the Somme induced Ludendorff to modify it. It appears also that the Crown Prince, in whose Group of Armies were the forces in the left of the German advance, urged him to adhere to his first plan even after the battle had been several days in progress.