In a =containing action= one should endeavor to employ few rifles but, on the other hand, expend much ammunition, and keep supports and reserves far in rear so as to minimize the losses. If the force is to deploy first of all only for fire action, but is later to participate in the decisive attack, it will be advisable to place two companies in the first line, one in the second, and one in the third. The companies in the second and third lines will then be less exposed to hostile fire, and the battalion commander will be able, by first launching one and then the other company, to exercise an influence on the course of the action during a longer period than would otherwise be possible. (See “b”). [Illustration] =When a battalion is fighting as part of a larger force=, and when both its flanks are secure, it will need only supports for feeding the frontal attack (par. 289 German I. D. R.) and can cover a greater front. A reserve may either be entirely dispensed with, or made very weak. When only one flank of the battalion is secure, the threatened flank should be protected by echeloning the supports and the reserve in rear of it. In this position, these echelons are not so apt to be bullet-stops as when they are placed in rear of the center. Besides, they can more easily execute enveloping movements and can take a hostile flank attack in flank. When both flanks are in the air, only the most essential precautions should be taken on the one flank, while on the other everything available is united for the decisive attack. In =defense=, three companies can sometimes be taken into the first line for the purpose of developing a strong fire, while the fourth company is held in rear of a threatened flank or in rear of the center. (See “d”). When it is desired to employ the reserve offensively, only one or two companies are placed in the first line, the others being held in reserve in rear of the flank which is to take the offensive. Interval and distance increase with the size of this reserve. [Illustration] When a battalion from the reserve is called upon to make an immediate attack which has been prepared by the fire of other troops, all its companies may be taken at once into the first line. In this case the battalion may be formed for attack with its companies at close intervals. This might also be a suitable combat formation for night operations. All these formations are subject to change however, as soon as the proper utilization of cover makes it necessary. The general principles stated for a battalion are also applicable to a =regiment=. The regiment may either be directly formed for attack, or the heads of the battalions may be deflected toward the points where the deployment is to take place. An interval of 300-400 m. between heads of battalions is best calculated to facilitate the subsequent deployment. The distances depend upon the nature of the ground and the purpose of the combat.