MCRP 12-10B.1, page 98

Section II Infantry Battalion Defense of a Built-Up Area This section addresses some of the missions a task-organized and/or reinforced infantry battalion could be assigned. These missions are normally conducted as part of a larger joint operation. 3201. Defense in Sector. An infantry battalion is normally given the mission of defending a sector in a city (Figure 3-9). The interior buildings in the battalion sector form battle positions for the battalion’s fixed defense. The size of a sector varies, but may cover the outlying structures and can be used to provide early warning and to delay the enemy. Figure 3-9. Defense of a Built-Up Sector a. Defensive operations begin with the reconnoitering of the assigned sector to learn the terrain and to orient toward the enemy’s expected advance. The main defensive positions should be formed on key terrain features, such as prominent buildings, road junctions, and positions which offer good fields of fire. Long-range antiarmor weapon systems should be deployed to engage the enemy as early as possible. b. Depending on the situation, a reinforced rifle company may be used as a security force. The security force would operate forward of the FEBA and, depending on the mission, cause the enemy to deploy without without becoming decisively engaged. This can be done through maximum use of ambushes and obstacles while using covered and concealed routes. These routes are used for disengagement. Covered and concealed routes can be artificially made by making holes through buildings. The security force also attempts to detect the location of the Military Operations on Urbanized Terrain 3-26