We have moreover to consider, in this connection, the strength of the infantry, the formation of the cavalry, and whether the latter charges from several directions or in several successive lines. A small force of infantry, especially when it may anticipate attacks from several directions, must open fire sooner than a strong infantry force which has to contend with an attack coming from one direction only. In the first mentioned case, an attempt must be made to meet quickly, one by one, the attacks which follow each other at intervals. It is quite a different matter when the infantry itself is not directly threatened, but can take a hand in repulsing a cavalry charge made on another unit; then it is advisable to open fire at an early moment in order to break the momentum of the charge at long range. (11th Jäger-Battalion at Wörth; 8th Company of the 46th Infantry at Sedan). This in part determines the rear sight elevation that should be used. The sights should not be changed on the battlefield, although this has been done on the drill ground by well trained soldiers without impairing the continuity or accuracy of the fire. According to the table of ordinates of the trajectory (par. 23 German I. F. R.), a bullet fired when the sight is set at 700 m. and aim is taken at the feet of the horse, does not rise above the height of a mounted trooper throughout that entire distance. The bullets may pass entirely over the target however, when the men take too full a sight in the excitement of battle, or when, in rolling country or terrain covered with grass or crops, they cannot see the bottom of the target and aim above that line. It is better, therefore, to aim at the breast of the horse, with sights set at 600 m., and to fire as soon as the target gets within 800 m. On account of the excitement attending every cavalry charge, it is not advisable to change sights. It is a good plan to fire one volley first and then to employ fire at will. It is not easy for infantry, while awaiting the onrushing mass of cavalry, to reserve its fire until, in the opinion of the leader, the first shot may be fired. But this waiting is of great importance to prevent the fire from becoming wild and ineffective. Since the elimination of powder smoke, there is no reason why other volleys should be fired after the first, for in the excitement of the fight the volley cannot produce a moral effect. The horses certainly find the rattling of fire at will more unpleasant than the sudden crack of a volley. The advantage of the volley, of permitting a unit to be kept better in hand, may be an important factor under certain circumstances however. The volley should, as a rule, be used by supports that are not exposed to fire. (8th Company of the 32nd Infantry at Wörth; the 1st and 2nd Companies of the 83rd Infantry, and the 5th Company of Jägers at Sedan).