Square division

A square division is a designation given to the way military divisions are organized. In a square organization, the division's main body is composed of four regimental elements. Since a regiment could be split into separate battalions for tactical purposes, the natural division within a division would be to have two regiments bound together as a brigade. On an organizational chart and if the entire division were formed up in the field, the two brigades of two regiments would typically form a square, hence the name.