After the victorious conclusion of the Balkan campaign in the winter of 1915-16 Ludendorff contemplated a great offensive into the heart of the Ukraine, with the object of breaking the back of the economic resistance of Greater Russia, which was already cut off from the sea. The offensive necessitated the occupation of Rumania; but General von Falkenhayn rejected this scheme, and chose Verdun instead of Kiev as the objective for operations. Accordingly in the year 106 the eastern front of the allied Central Powers was assigned the duty of protecting the rear of the offensive movement in France. This task was amply fulfilled on the northern wing but on the southern wing, held by the Austrians, the front completely collapsed in June and July at Luck and in Galicia. The balance in the East was restored with difficulty by the intervention of the German com mand.
On Aug. 29 Field-Marshal von Hindenburg assumed the office of chief of the general staff of the armies in the field, in the place of Falkenhayn, and Ludendorff became first quartermaster general. In contrast with their predecessor's point of view, the two men still promised themselves triumph, but a triumph which could only result from a more vigorous conduct of the war by drawing upon the whole available strength of the country in wealth and population. The methods adopted for the utilization of these resources were expressed in the so-called "Hindenburg programme" of war industries and in the so-called law of auxili ary services ; and here Ludendorff could only co-operate by means of suggestions and demands. In his own sphere too, he found that, owing to the almost desperate military situation inherited from his predecessor, he was not at first able to put into practice Schlieffen's doctrine of annihilation. The result of the offensive against Rumania was that this new enemy was over thrown in the winter of 1916. This victory was of inestimable value to the Central Powers, for new sources of economic power were thereby opened up.
Unrestricted U-boat warfare did not altogether fulfil expec tations. The technical perfection of the enemy's defensive weap ons and the ample scale upon which they had been completed contributed to this in a very material degree. On the other hand, without the adoption of unrestricted U-boat warfare the strategy of the Central Powers would have been altogether unable to hold the balance on land in suspense until, after Russia's col lapse in the spring of 5918, there dawned a well-founded pros pect of forcing a decision in France before the American forces on land became effective.
In the spring of 1917 in the western theatre of war Luden dorff was enabled, by a timely withdrawal to the Siegfried posi tion and by the elasticity of his defensive tactics, to impose a check upon the Allied attack carried out with a gigantic expend iture of men and material. Subsequently he had another oppor tunity of vindicating his theory of annihilation in the warfare on land. Under the blows dealt by the German hammer at Tarno pol, Riga, Dago and osel, Russia fell. The reckoning with Italy followed in the autumn of 5917, but the situation in the west, particularly in Flanders where the fighting raged with undimin ished fury, rendered it impossible for Ludendorff to secure a decisive victory.