5. The support of cavalry during delaying actions (ammunition being in this case a substitute for men) although the fire effect against low targets is very small. 6. The holding of captured positions. _In defense_ the isolated employment of machine guns at a distance from the organization is prohibited and their use against extended skirmish lines cautioned against. Machine guns are well adapted for protecting flanks and can be kept back as a reserve to prevent the advance of hostile reinforcements, to support counter-attacks, to direct fire against deep and dense targets, and, finally, to support the firing line in action at short range. _In defense_ the principal duties of machine guns will consist of-- 1. Sweeping obstacles and commanding terrain which is specially favorable for the attack; flanking of salients. 2. Reinforcing weak points. 3. Firing on advancing hostile reinforcements. The cavalry regulations, contrary to those of the infantry, also permit a massed employment of machine guns when ordered by brigade or division commanders. “As a rule, it will not be advisable to open fire on isolated mounted men or small groups of approximately platoon strength, as this would betray the position prematurely. In action, machine guns may be employed in conjunction with dismounted skirmishers for the purpose of forming a supporting point for movements, a rallying position, or for protecting a flank. Finally, during an attack, machine guns may support the fire of the horse battery, on the outer flank of which they go into position, to serve as support, or to facilitate by their fire a withdrawal.” These official regulations are not entirely in accord with the views entertained in the army. The combined use of the machine guns of a brigade, such as quite naturally resulted in the engagement at =Pieters Hill=, is advocated by many. At the longer ranges, machine gun companies are to fire on favorable targets, discontinuing their fire when their object has been accomplished. In addition they are to cover the advance or withdrawal of the infantry; to fire on certain points of the hostile position; to act against the enemy’s flanks in pursuit; and, in defense, posted in pairs, they are to flank salient angles and make it difficult for the enemy to approach the obstacles. In =Switzerland= machine guns are considered an auxiliary arm. “Our field army should be capable of accepting and sustaining battle in the mountains and on highland plateaus without necessitating the creation of numerous special detachments for that purpose. Machine gun companies should be a tool which can be used in the mountains and on highland plateaus, and which can be turned over for use to any organization.”