advance guard(redirected from advance guards)
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A detachment of troops sent ahead of a main force to reconnoiter and provide protection.
1. (Military) a military unit sent ahead of a main body to find gaps in enemy defences, clear away minor opposition, and prevent unexpected contact
2. (Military) a temporary military detachment sent ahead of a force to prepare for a landing or other operation, esp by making reconnaissance
Detachment sent ahead of the main force to ensure its uninterrupted advance; to protect the main body against surprise; to facilitate the advance by removing obstacles and repairing roads and bridges; and to cover the deployment of the main body if it is committed to action.