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Company (army) : ウィキペディア英語版
Company (military unit)

A company is a military unit, typically consisting of 80–250 soldiers and usually commanded by a major. Most companies are formed of three to six platoons, although the exact number may vary by country, unit type, and structure. Several companies are grouped to form a battalion or regiment, the latter of which is sometimes formed by several battalions.
Certain sub-units were raised as independent companies that reported to no higher unit headquarters.
==Historical background==

The modern military unit “company” became popularized during the reorganization of the Swedish Army in 1631 under King Gustav II Adolph. For administrative purposes, the infantry was divided into companies consisting of 150 men, grouped into regiments of eight companies. Tactically, the infantry companies were organized into "battalions" and grouped with cavalry troops and artillery batteries to form “brigades”.
From ancient times, some armies have commonly used a base administrative and tactical unit of around 100 men. (Perhaps the most well-known is the Roman century, originally intended as a 100-man unit, but later ranging from about 60-80 men, depending on the time period.) An organization based on the decimal number system (i.e., by tens, hundreds, thousands, and ten-thousands) might seem intuitive to most, if not also highly logical, based on the common anatomical counting device created by using the ten digits of the human hands in numbering objects, animals, people, etc. Therefore, to the Romans, for example, a unit of 100 men seemed sufficiently large enough to efficiently facilitate organizing a large body of men numbering into the several thousands, yet small enough that one man could reasonably expect to command it as a cohesive unit by using his voice and physical presence, supplemented by musical notes (e.g., drum beats, bugle or trumpet blasts, etc.) and visual cues (e.g., colors, standards, guidons, etc.).
Furthermore, recent studies have indicated that humans are best able to maintain stable relationships in a cohesive group numbering between 100-250 members, with 150 members being the common number (see Dunbar’s number). Again, a military unit on the order of no more than 100 members, and perhaps ideally fewer, would perhaps present the greatest efficiency as well as effectiveness of control, on a battlefield where the stress, danger, fear, noise, confusion, and the general condition known as the “fog of war” would present the greatest challenge to an officer to command a group of men engaged in mortal combat. Indeed, until the latter half of the 19th century, when infantry troops still routinely fought in close-order, marching and firing shoulder-to-shoulder in lines facing the enemy, the company remained at around 100, or fewer, men.
The advent of accurate, long-range rifle fire, repeating rifles, and machine guns necessitated highly dispersed combat formations. This reality, coupled with the advent of radio communication, permitted relatively small numbers of men to have much greater firepower and combat effectiveness than previously possible. Companies, however, continue to remain within the general range of 100-250 members, perhaps validating the premise that men fight best (as well as live, work, socialize, play, etc.) in organizations of around 150 members, more or less.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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