The patrol leader assembles the men detailed for the patrol. He inspects their arms and ammunition and satisfies himself that they are in suitable condition for the duty. He sees that none has any papers, maps, etc., that would be of value to the enemy if captured. He sees that their accouterments do not glisten or rattle when they move. He then repeats his instructions to the patrol and assures himself that every man understands them. He explains the signals to be used and satisfies himself that they are understood. He designates a man to take his place should he be disabled. 610. The formation and movements of the patrol must be regulated so as to render probable the escape of at least one man should the patrol encounter a superior force. The formation will depend upon the nature of the ground traversed and the cover afforded. The leader must adopt the formation and measures best suited to the accomplishment of his object. In general, it should have the formation of a main body with advance, rear, and flank guards, though each be represented only by a single man. 611. The distances separating the members of the patrol vary according to the ground. If too close together, they see no more than one man; if too widely separated they are likely to be lost to the control of the leader. With a patrol of four or five men the distances may vary from 25 to 50 yards; with a larger patrol they may be as great as 100 yards. At times a column of files, separated by the distances prescribed, is a satisfactory formation. 612. The country must be carefully observed as the patrol advances. In passing over a hill, the country beyond should first be observed by one man; houses, inclosures, etc., should be approached in a similar manner or avoided entirely; woods should generally be reconnoitered in a thin skirmish line. 613. The strength and composition of hostile troops must be observed. If they can not be counted, their strength may be estimated by the length of time a column consumes in passing a given point, or by the area covered if in camp. Patrol leaders should know, if practicable, the uniforms, guidons, etc., of the enemy, as it will assist in determining the class of troops seen when no other means for doing so are available. Insignia from the enemy's uniforms, picked up by patrols, often convey valuable information by indicating what troops are in the vicinity. 614. Patrols avoid fighting, except in self-defense or in order to prevent the enemy's patrols from gaining valuable information, or when necessary in order to accomplish their mission. In such cases, a patrol should fight resolutely even though inferior in numbers. 615. Information gained by patrols is generally of no value unless received in time to be of use to the commander. Patrol leaders must therefore send back information of importance as soon as it is gained unless the patrol itself is to return at once.