In military tactics, a flanking maneuver (also called a flank attack), is an attack on the sides or rear of an opposing force. If a flanking maneuver succeeds, the opposing force would be surrounded or have to fight from two or more directions. This reduces the ability of the outflanked force to move or defend itself. Unlike an envelopment, which depends on the enemy's defensive position, any obstacles and the terrain, a flanking maneuver uses the enemy's forward movement to create an attackable flank. A psychological advantage may also be present. The confusion and threat from multiple directions can often cause shock and panic. This may cause soldiers to run from the battle. A larger-scaled tactical flanking is called a strategic flanking. This is where the targets of the flanking could be as large as divisions or even entire armies.