The purpose of a screen in military tactics primarily is to:

In military tactics, a screen is employed to provide early warning of enemy movements while offering the least amount of protection to the units conducting the screening. The primary objective of a screen is to enhance situational awareness and ensure that the main body of forces can prepare for impending engagements.

By establishing a forward posture without committing to heavy engagements, the screening units can alert the main force to any enemy activity, allowing for timely response and reinforcement as necessary. This approach balances the need for intelligence gathering and early warning against the risks associated with heavy defensive measures, which can compromise mobility and flexibility. The effectiveness of a screen lies in its ability to act as an advance guard rather than a solid defensive line, making it essential for anticipating enemy actions and adjusting tactics accordingly.