6-157. A defending unit within the MBA uses a variety of tactics, techniques, and procedures to accomplish the mission. At one end of the area defensive continuum is a totally static defense oriented on terrain retention. This defense depends on the use of firepower from prepared, protected positions to concentrate combat power against attempted enemy breakthroughs and flanking movements to deny the enemy terrain. At the other end of the area defensive continuum is a dynamic defense focused on the enemy that routinely displaces defending forces from position to position. The defending commander uses mobile forces to cover gaps between defensive positions, reinforces those positions as necessary, and counterattacks to seal penetrations or block enemy attempts at flanking movements. Throughout the area defense continuum, the defending force repeatedly lures or drives the enemy into EAs for destruction in detail. The performance of most area defense falls somewhere between the two extremes.