If, after breaking through the German defense systems on this front, we could secure Bourlon to the north, and establish a good flank position to the east, in the direction of Cambrai, we should be well placed to exploit the situation locally between Bourlon and the Sensée River and to the northwest. The capture of Cambrai itself was subsidiary to this operation, the object of our advance toward that town being primarily to cover our flank and puzzle the enemy regarding our intentions. The enemy was laying out fresh lines of defense behind those which he had already completed on the Cambrai front; and it was to be expected that his troops would be redistributed as soon as our pressure in Flanders was relaxed. He had already brought large forces from Russia in exchange for divisions exhausted in the struggle in the western theatre, and it was practically certain that heavy reinforcements would be brought from east to west during the Winter. Moreover, his tired divisions, after a Winter's rest, would recover their efficiency. For all these reasons, if the existing opportunity for a surprise attack were allowed to lapse, it would probably be many months before an equally favorable one would again offer itself. Furthermore, having regard to the future, it was desirable to show the enemy that he could not with impunity reduce his garrisons beyond a certain point without incurring grave risks. Against these arguments in favor of immediate action I had to weigh the fact that my own troops had been engaged for many months in heavy fighting, and that, though their efforts had been uniformly successful, the conditions of the struggle had greatly taxed their strength. Only part of the losses in my divisions had been replaced, and many recently arrived drafts, still far from being fully trained, were included in the ranks of the armies. Under these conditions it was a serious matter to make a further heavy call on my troops at the end of such a strenuous year. On the other hand, from the nature of the operation, the size of the force which could be employed was bound, in any case, to be comparatively small, since success depended so much on secrecy, and it is impossible to keep secret the concentration of very large forces. The demand made upon my resources, therefore, should not be a great one. While considering these different factors, preparations were quietly carried on, so that all might be ready for the attack if I found it possible to carry it out. The success of the enemy's offensive in Italy subsequently added great force to the arguments in favor of undertaking the operation, although the means at my disposal for the purpose were further reduced as a consequence of the Italian situation.