What does a 'file' refer to in military formations?

A 'file' in military formations refers to a column of soldiers arranged one behind the other. This formation is characterized by having a single line of troops extending forward or backward, which allows for more straightforward movement and easier control when navigating through tight spaces or confined areas. Such a configuration is often used in various tactical situations where units need to move in an organized manner while maintaining discipline and coordination among individuals.

Understanding this term is crucial for military personnel as it describes a fundamental form of organization that is versatile and effective in numerous operational scenarios. The other options describe different formations—such as a line of soldiers side by side or a rectangular formation—each serving distinct purposes in military drills and maneuvers, but they do not accurately capture the specific nature of a 'file.'