What is defined as the space from side to side of a formation including the right and left elements?

The definition that describes the space from side to side of a formation, including both the right and left elements, is referred to as the flank. In a military context, a flank is the side of a formation, encompassing the entire width of that formation. This term is crucial for understanding how formations operate and interact on the drill field, as it refers to the lateral extent of the unit rather than just a singular side element.

The concept of flank is significant because it helps in maneuvers and formations, ensuring that leaders can effectively command and instruct based on the positioning of their personnel. For example, knowing how to maintain a strong flank is essential for protecting the formation against potential threats from the sides.

In contrast, terms like formation, line, and file describe specific arrangements or structures within military units. A formation refers to the overall arrangement of troops or units; a line is a specific type of formation where troops are arranged side by side; and a file is a straight line of soldiers or vehicles one behind the other. Each of these terms has its own distinct meaning and use in military terminology, differentiating them from the specific definition of flank.