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Barrage (artillery)

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Barrage (artillery)

In military usage, a barrage is massed sustained artillery fire (shelling) aimed at a series of points along a line. In addition to attacking any enemy in the kill zone, a barrage intends to suppress enemy movements and deny access across that line of barrage. The impact points along the line may be 20 to 30 yards apart, with the total line length of the barrage zone anything from a few hundred to several thousand yards long. Barrages can consist of multiple such lines, usually about 100 yards apart, with the barrage shifting from one line to the next over time, or several lines may be targeted simultaneously.

A barrage may involve a few or many artillery batteries, or even (rarely) a single gun. Typically each gun in a barrage, using indirect fire, will fire continuously at a steady rate at its assigned point for an assigned time before moving onto the next target, following the barrage's detailed timetable. Barrages typically use high-explosive shells, but may also be shrapnel, smoke, illumination, poison gas (in World War I), or potentially other chemical agents. Barrages are in contrast with concentrated artillery fire, which has a single specific target such as a known enemy position or structure, and in contrast with direct fire which targets enemies within the direct line of sight of the gun.

Barrages may be used defensively or offensively, and have a variety of patterns. Defensive ones are often static (such as a standing barrage) while offensive ones are moved in coordination with the advancing friendly troops (such as creeping, rolling, or block barrages). They may target along the front line, or further into enemy back area to isolate certain enemy positions (such as a box barrage). A series of different patterns may be employed as a battle develops, with each barrage lasting only a few minutes or many hours. Barrages are usually integral with larger operations of multiple military formations, from divisions to armies, requiring days to weeks of preparation and exact planning.

The barrage was developed by the British Army in the Second Boer War. It came to prominence in World War I, notably its use by the British Expeditionary Force and particularly from late 1915 onwards when the British realized that the suppressive effects of artillery to provide covering fire were the key to breaking into defensive positions. By late 1916 the creeping barrage was the standard means of applying artillery fire to support an infantry attack, with the infantry following the advancing barrage as closely as possible. Its employment in this way recognised the importance of artillery fire in suppressing or neutralizing, rather than destroying, the enemy. It was found that a moving barrage immediately followed by the infantry assault could be far more effective than weeks of preliminary bombardment.

Barrages remained in use in World War II and later, but only as one of a variety of artillery tactics made possible by improvements in predicted fire, target location and communications. The term barrage is widely - and technically incorrectly - used in the popular media for any artillery fire.

The moving barrage was developed during the Boer War, one of several tactical innovations instituted under command of General Redvers Buller. It was a response to Boer defensive positions, notably at Tugela Heights and effective long range rifle fire.

Artillery usually fired over open sights at visible targets, until the Second Boer War when indirect fire started to be used. The largest unit accustomed to firing at a single target was the brigade (i.e. an artillery battalion), normally 18 guns. Trench warfare led to the necessity for indirect firing through the use of observers, more sophisticated artillery fire plans and an increasingly scientific approach to gunnery. Gunners had to use increasingly complicated calculations to lay the guns. Individual guns were aimed so that their fall of shot was co-ordinated with others to form a pattern; in the case of a barrage, the pattern was a line. The term “barrage” was first used in World War I in English in the orders for the Battle of Neuve Chapelle in 1915.

A lifting barrage was a development in which the barrage lifted periodically to a target further back, such as a second line of trenches. This was countered by the defenders infiltrating troops and machine guns into no-man's land or the areas between their own trench lines, so it was found necessary to comb the entire area of the advance with artillery fire.

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