Line

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Prussian Infantry attacking in lines during the Battle of Hohenfriedberg.

The line formation is a standard tactical formation which has been used throughout history. This formation provided the best frontage for volley fire, while sacrificing maneuverability and defence against cavalry. The line formation came to the fore during the Age of Reason, when it was used to great effect by Frederick the Great and his enemies during the Seven Years' War.

An infantry battalion would form "in line" by placing troops in several ranks, ranging in number from two to five, with three ranks being the most common arrangement. Each rank was approximately half a meter apart from the next, and soldiers in a rank were positioned closely to each other (usually within arm's length), with just enough room to present their weapons, fire, and reload. The line formation required that the troops be well-drilled and constantly supervised by officers and non-commissioned officers (NCOs).

In 17th and 18th century European armies, NCOs were positioned to the rear of the line. They were equipped with long polearms, which they used to "dress" or arrange the ranks, a practice which included pushing down the weapons of any soldier who was aiming too high, as well as ensuring that the rank remained well-organized and correctly placed. Movement in line formation was very slow, and unless the battalion was superbly trained, a breakdown in cohesion was virtually assured, especially in any kind of uneven or wooded terrain. As a result, line was mostly used as a stationary formation, with troops moving in columns and then deploying to line at their destination.

In addition, the line formation was extremely vulnerable to cavalry charges, particularly from the flanks and rear, and these attacks usually resulted in the complete breakdown of cohesion and even destruction of the unit unless it was able to "form square".

During the Napoleonic Wars, the British Army famously adopted a thin two-rank line formation. This was adopted to compensate for their lack of numbers and to maximize their fire frontage. The British continued to use a two-rank line until the late 19th century. The famous Thin Red Line of the 93rd (Highland) Regiment at the Battle of Balaklava successfully held against a Russian cavalry attack, a very rare occurrence.

A loose line formation is also used by many modern forces during assaults as it enables maximum firepower to be directed in one direction at once, useful when attacking an enemy position. It also enables the use of fire and movement.

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