Suppressive fire

In military science, suppressive fire is "fire that degrades the performance of an enemy force below the level needed to fulfill its mission". When used to protect exposed friendly troops advancing on the battlefield, it is commonly called covering fire. Suppression is usually only effective for the duration of the fire. It is one of three types of fire support, which is defined by NATO as "the application of fire, coordinated with the maneuver of forces, to destroy, neutralise or suppress the enemy". Before NATO defined the term, the British and Commonwealth armies generally used "neutralisation" with the same definition as suppression. NATO now defines neutralisation as "fire delivered to render a target temporarily ineffective or unusable." Suppressive fire usually achieves its effect by threatening casualties to individuals who expose themselves to it, forcing them to inactivity and ineffectiveness by keeping their heads down, 'or else take a bullet'. Willingness to expose themselves varies depending on the morale, motivation and leadership of the target troops. Suppressive fire is often used as covering fire, defined by NATO as "Fire used to protect troops when they are within range of enemy small arms." This is sometimes called "winning the firefight" in an infantry-only action. However, suppressive fire may be used against indirect firers, enemy air defenses or other military activities such as construction work or logistic activities, or to deny an area to the enemy for a short period of time (it is unsuitable for prolonged area denial due to ammunition supply constraints). Using smoke to 'blind' enemy observation is a form of non-lethal suppression and at night illuminating flares may be used to suppress enemy activities by denying them the cover of darkness. Suppression can be delivered by any weapon or group of weapons capable of delivering the required intensity of fire for the required period of suppression. Suppressive fire capabilities vary widely because the suppressive effect area varies widely.

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Indirect fire

Indirect fire is aiming and firing a projectile without relying on a direct line of sight between the gun and its target, as in the case of direct fire. Aiming is performed by calculating azimuth and inclination, and may include correcting aim by observing the fall of shot and calculating new angles. Indirect fire is most commonly used by field artillery and mortars (although field artillery was originally and until after World War I a direct fire weapon, hence the bullet-shields fitted to the carriages of guns such as the famous M1897 75 mm).