Envelopment is the military tactic of attacking the enemy's flank or rear. This is done while keeping the enemy's attention focused on his front by the use of diversionary attacks. The envelopment makes the enemy fight in a direction they are the least prepared for. The maneuver requires a flank that can be attacked. Unlike a flanking maneuver, which uses the enemy's forward movement to create an attackable flank, envelopment depends on the enemy's defensive position, any obstacles and the terrain. The envelopment has both advantages and disadvantages. Advantages include being able to capture or defeat all or part of an opposing army. It offers less risk than other offensive maneuvers. Disadvantages include the possibility of an enemy counterattack on the weakened center or on the other flank.