Outpost patrols are divided into those which operate beyond the lines and those whose duty lies principally within the lines. The former, called reconnoitering patrols, scout in the direction of the enemy; the latter, called visiting patrols, maintain communication between the parts of the outpost and supervise the performance of duty on the line of observation. Reconnoissance should be continuous. Though scouts and detachments of cavalry remain in contact with the enemy, or at least push forward to a considerable distance, more detailed reconnoissance by infantry patrols in the foreground must not be neglected. Reconnoitering patrols are composed of at least two men and a skillful leader, who, in important cases, would be an officer. They obtain information, ascertain the presence of the enemy, or discover his approach. All patrols, when they cross the line of observation, inform the nearest sentinel of the direction in which they are to advance; on their return they similarly report what they have seen of the enemy; signals are agreed upon so that they can be recognized when returning. Any ground near the line of observation which might afford cover for troops, or for scouts or spies, and the approach to which can not be observed by sentinels, is searched frequently by patrols. Definite information concerning the enemy is reported at once. Patrols fire only in self-defense or to give the alarm. Supports on the flank of an outpost position patrol the country on the exposed flank. Visiting patrols and reliefs should not march in the open and thereby expose the position of sentinels. During a march in the vicinity of the enemy when halts are made, special measures for protection are taken. When the halt is for a short period, less than half an hour, the advance party and support remain at ease, the point and flankers move to positions from which they can obtain a good lookout, and additional patrols may be sent out from advance parties and supports. Where the halt is for a period exceeding half an hour a =march outpost= should be formed. With an advance guard consisting of a squadron, one troop as support and three as reserve, a suggested form of march outpost might be formed as follows: The leading platoon moving to the front at a trot for 400 yards would be outguard No. 2; the next platoon in rear, moving to the right at a trot for about 600 to 800 yards would be outguard No. 1; the next platoon, moving to the left in the same manner would be outguard No. 3; and the 4th platoon would be the support of the march outpost. The reserve (3 troops) would be the reserve of the march outpost. On signal being given to resume the march, the various units would close in at a trot or gallop, and as soon as the support had assembled the march would be resumed. =Section 8. Rifle trenches.=