The guiding principle of our preparations for war must be, as I have already said, the development of the greatest fighting strength and the greatest tactical efficiency, in order through them to be in a position to carry on an offensive war successfully. What follows will, therefore, fall naturally under these two heads. Fighting strength rests partly, as already said, on the training (which will be discussed later), the arming, and the _personnel_, partly on the composition of the troops, and, therefore, in the case of line regiments, with which we chiefly have to deal, since they are the real field troops, on the strength of their peace establishment. It was shown in the previous chapter how essential it is to have in the standing army not only the necessary cadres ready for the new formations, but to make the separate branches so strong that they can easily be brought up to full strength in war-time. The efficiency and character of the superiors, the officers and the non-commissioned officers, are equally weighty factors in the value of the troops. They are the professional supporters of discipline, decision, and initiative, and, since they are the teachers of the troops, they determine their intellectual standard. The number of permanent officers on the establishment in peace is exceedingly small in proportion to their duties in the training of the troops and to the demands made of them on mobilization. If we reflect how many officers and non-commissioned officers from the standing army must be transferred to the new formations in order to vitalize them, and how the modern tactical forms make it difficult for the superior officer to assert his influence in battle, the numerical inadequacy of the existing _personnel_ is clearly demonstrated. This applies mainly to the infantry, and in their case, since they are the decisive arm, a sufficient number of efficient officers is essential. All the more important is it, on the one hand, to keep the establishment of officers and non-commissioned officers in the infantry at full strength, and, on the other hand, to raise the efficiency of the officers and non-commissioned officers on leave or in the reserve. This latter is a question of training, and does not come into the present discussion.