What defines alternate bounds in military movement?

Alternate bounds in military movement refer to a tactical maneuver where only one section or unit moves at a time, while the other remains in a covered and secure position. This technique allows for continued security and support, ensuring that at least one unit is able to provide observation or fire support while the other moves to a new location. By alternating movement, the units can effectively minimize their exposure to enemy fire and enhance their overall operational effectiveness.

In this context, while the other options describe different aspects of military movement, they do not encapsulate the principle of alternate bounds. For example, simultaneous movement of all units would expose them to higher risk without providing adequate cover or support. Units withdrawing to a secure position does not address the coordinated movement aspect of alternate bounds, and movement conducted in a line does not accurately represent the staggered approach that alternate bounds entail. The emphasis on one section moving while the other provides security is the key characteristic that defines alternate bounds.