Fire and Movement

Fire and movement or fire and maneuver is a military tactic that uses suppressive fire to decrease the enemy's ability to return fire, its organization unit cohesion, and morale. The tactic is used by small unit commanders on the modern battlefield. The "movement" part of the action consists of a separate organizational unit moving forward in greater safety afforded by the suppressive fire laid down on the enemy.

History
Swedish King Gustavus Adolfus was likely the first to use the tactic in wartime, in the Thirty Years' War against his Catholic opponents.

During the First Boer War, it was a standard Boer tactic, and contributed to a series of victories, culminating at the Battle of Majuba Hill.

Overview
Fire and movement can be performed by any unit made up of at least two soldiers. The first part of the military unit suppresses the enemy by firing from behind cover, while the second advances. After a short time, the advancing unit will halt behind cover and open fire, allowing the second to advance. The two parts of the unit will repeat the cycle until the objective is met. Enemy suppression can also be achieved with direct and/or indirect fire from combat support units. Artillery, mortars and armor are a few examples of combat support units often used in fire and movement.

In the United States Military, a basic fire and movement tactic is called overwatch. There also exists several variations of overwatch, generally adding further description to more accurately describe the specific maneuver.

A unit fires upon an enemy to distract or suppress them allowing another unit to assault, flank or encircle the enemy. The enemy will be pinned down and can not react, and will be forced to take cover until the flanking unit engages them.

Suppression
Heavy and continuous suppression fire keeps an opponent in a defensive posture (hunkered in their foxholes instead of taking aimed shots) and therefore limits the enemy's overall firepower. Suppressive fire also prevents the enemy from properly assessing the attack and organizing a coherent and coordinated defense or counter-attack.

Advance
While a base of fire is set up, the second unit will advance to cover in front, in the process setting up a new base of fire at this point. After a new base of fire has been set up, the first unit will advance, under cover of the new fire base, to a new position and set up another base of fire.

Assault
These actions are repeated until the units have closed upon the enemy position. At this point they engage directly with the enemy, often with grenade-throwing, close-quarters battle techniques, and hand-to-hand combat.