What is it called when a force moves through another unit's positions?

The term that describes the action of a force moving through another unit's positions is known as "passage of lines." This tactical maneuver allows one unit to effectively navigate through the area occupied by another unit, ensuring seamless continuity of operations and maintaining momentum. It is a crucial aspect of troop movements in complex battlefield scenarios, allowing forces to reposition while minimizing disruption to both units involved.

The passage of lines is often carefully coordinated to ensure mutual understanding and safety, as well as to leverage the strengths of the units involved. This action may involve communication and timing to prevent confusion and maintain situational awareness on the battlefield.

In contrast, linkup refers to the meeting of two or more forces, relief in place describes the process by which one unit takes over responsibilities from another, and reconnaissance involves gathering information about the environment or enemy positions. Each of these tactics serves distinct purposes within military operations, with "passage of lines" specifically addressing the movement through established positions.