Strafing is the military practice of attacking ground targets from low-flying aircraft using aircraft-mounted automatic weapons. Less commonly, the term is used by extension to describe high-speed firing runs by any land or naval craft such as fast boats, using smaller-caliber weapons and targeting stationary or slowly-moving targets.
Etymology
The word is an adaptation of German strafen, to punish, specifically from the humorous adaptation of the German anti-British slogan Gott strafe England (May God punish England), dating back to World War I.
Description
Guns used in strafing range in caliber from machine guns, to autocannon or rotary cannon. Although ground attack using automatic weapons fire is very often accompanied with bombing or rocket fire, the term "strafing" does not specifically include the last two.
The term "strafing" can cover either fixed guns, or aimable (flexible) guns. Fixed guns firing directly ahead tend to be more predominant on fixed wing aircraft, while helicopters tend to use gimballed weapons which can be fired in many different directions independent of the direction the aircraft is pointing in (in most cases, flexible guns on a fixed wing aircraft are for defense purposes only, although they can sometimes be used to fire on ground targets to limited effect).
Some fixed wing aircraft, like fighter-bombers, are capable of flying either air-combat missions or ground attack missions (P-47 Thunderbolt), while others are dedicated ground-attack types (Il-2 Sturmovik). In cases where an aircraft is capable of both types of combat, when it is assigned to a ground attack role, and thus expected to be using the guns mostly for strafing, the fixed weapons are often mounted so that the convergence point is lower and at a greater range than would be used for air combat. This is helpful because it allows the pilot to aim at a target without having to dive towards the ground as steeply, decreasing the risk of collision with the ground and increasing the amount of firing time available before having to pull up, and it also increases the range from the target, helping avoid anti-aircraft fire and potential damage from exploding targets. Consequently, several types of aircraft-mounted gun pods like the Soviet SPPU-22 allowed for a mechanical depression of their barrels.
Because of the low altitude and relatively low airspeed required for accurate strafing, it is very risky for the pilot, who is exposed not only to the risk of flight-into-terrain and obstacles such as power lines, but also to anti-aircraft weapons, including surface-to-air missiles (both vehicle mounted and hand-held), anti-aircraft artillery and small caliber weapons fire (such as machine guns and small arms). Planes purposely designed for ground attack may include additional armour around and underneath the cockpit and other vulnerable areas such as engines to protect the pilot and key flight components, while aircraft designed mostly for air combat tend to have most of their armor placed to protect directly ahead or to the rear, where fire from other aircraft is most likely, leaving them more vulnerable to fire from directly below or to the sides, where much ground fire often comes from.
History
World War I
While the earliest use of military aircraft was for observation and directing of artillery, strafing was frequently practised in World War I. Trenches and supply columns were routinely attacked from the air in the second half of the war. Strafing with machine guns was used when precision was needed (facing small targets), but non-strafing attack methods (primarily small bombs) were preferred for larger targets, area targets, or when low-altitude flying was too risky.
The German army was the first to introduce a class of aircraft specially designed for strafing, the ground-attack aircraft. Planes built specifically for strafing include the German World War I Junkers J.I, which was armored to protect it from ground-based gunfire. The Junkers J.I. had two downward-facing machine guns that were used for strafing.
World War II
These developments continued through World War II with dedicated aircraft including the concept of the heavily protected cockpit or "bathtub" to permit the pilot to survive counterfire from anti-aircraft batteries.
The Luftwaffe's best strafing plane was the Junkers Ju 87 Stuka. The Ju 87 G variant had two Rheinmetall-Borsig Flak 18 guns each mounted under the wing.