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arrangement for its three infantry regiments/brigades.) In positional warfare, infantry regiments are formed in line to cover as much of a sector as possible, and are positioned with two battalions forward and one battalion behind, to provide defense in depth. An infantry regimental commander typically holds a reinforced rifle company or two (and rarely an entire battalion) from one of his three infantry battalions, with supporting arms, in the rear as a regimental reserve.
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doctrine has all but eliminated the purpose of the all-arms regiment, and brigades are generally organized as combined arms units. The brigades are themselves typically triangular, with three subordinate maneuver battalions and supporting units. Recent reforms in the United States and several
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generally has its infantry units organized in a "three by three" format. Historically, this has usually meant three regiments comprising three infantry battalions, with the three regiments either controlled by a single brigade or directly by the divisional headquarters. (In many armies, more
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A square division typically operates with either: two infantry brigades in line, and one infantry regiment forward and one in reserve, or; on a narrower front, with the brigades echeloned (one ahead of the other), (In contrast, the triangular division normally employs a "two up, one back"
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European countries have placed greater emphasis on the brigade as the major tactical formation, with the division now acting more like a corps headquarters, controlling several relatively autonomous brigades and parceling out support units based on the tactical situation.
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during that war. Triangular divisions were smaller, allowing for more divisions to be formed, and were considered more suited for the positional warfare which characterized World War I. (See, for example, the organizational changes within the German Empire's
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formed its divisions as square divisions, in contrast to the prevailing
European norm. The United States had the manpower to form the divisions, and expected to be engaging in more
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Triangular division example: 1942 U.S. infantry division. The brigades of the square division have been removed, and there are three regiments directly under divisional control.
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recently, the infantry regiment, as a combat formation, has been abolished and triangular divisions are made up of three brigades, each consisting of three battalions.)
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elements. Other types of regiments, such as artillery, are not "maneuver" units and thus are not considered in the "square," viz, "four" (infantry) regiments scheme.
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Square division example: 1940 U.S. infantry division. On the far left can be seen two brigades of two regiments each
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divisions were organized as square divisions prior to 1938 when they began to form triangular divisions during the
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are organized. In a square organization, the division's main body is composed of four "maneuver," i.e., infantry
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divisions were organized as square divisions prior to mid-1938 during the
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The usual internal organization within a square division would be two
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armies, divisions were organized as square divisions prior to
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stalemate, which consumed so much of the war on the
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