“Ordinarily the flanks of a column on the march may be protected by small patrols sent out from time to time from the advance guard. There are occasions, however, when patrols will not suffice, as in the present situation, where it is known that hostile troops are operating on the flank of our line of march. In this case it is necessary to send out a stronger detachment to march parallel to the route of the main body. This detachment is denominated a _Flank Guard_ and is an element in the system of covering troops provided for the protection of a marching column. “The flank guard marches abreast of the column and assumes the general formation of an advance guard, having a point thrown out to the front, followed by the remainder of the detachment, much as an advance party and support. Patrols are sent out to the exposed flank whenever necessary, and communication is maintained with the main body by means of small patrols or connecting files. In some cases it may be necessary to detach a small rear guard, as in the case where a flank guard has been attacked by a comparatively large force of the enemy and has taken up a position to hold them off until the main body can pass the danger point and the flank guard resume its march. “The general duties of the flank guard are much the same as those of an advance guard; that is, to do everything possible to provide for the uninterrupted progress of the main body. All other duties are incidental to this and all have this prime object in view.” Solution _The Director_: “Lieutenant Williams, into what parts is your flank guard divided at this time?” _Lieutenant Williams_: “I would have an advance party and a support. Each element would consist of one section of three squads each. From the advance party a point consisting of one squad would be sent to the front.” _The Director_: “Had you thought of a formation in which the whole platoon is kept intact as one body with only a point of one squad out in front?” _Lieutenant Williams_: “Yes, sir. I had considered that possible formation and abandoned the idea because we can cover more road space with the formation that I have adopted and the more road space the flank guard can cover without undue dispersion the more of the column of the main body it covers and protects.” _The Director_: “All right. Now let us assume that we adopt your formation of an advance party with a squad as point and the second section as a support. What is the formation of your point, Captain Hastings?” _Captain Hastings_: “It would be in the ‘Boni Point’ formation, the men marching on alternate sides of the road with a distance of about 20 yards between them.” _The Director_: “I think that formation would be just right for this occasion. What is the next element of the flank guard?” _Captain Hastings_: “The connecting files, sir.” _The Director_: “How many of them?” _Captain Hastings_: “I would have two at least.”