1. The rearmost elements of an advancing or a withdrawing force. It has the following functions: to protect the rear of a column from hostile forces; during the withdrawal, to delay the enemy; during the advance, to keep supply routes open. 2. Security detachment that a moving ground force details to the rear to keep it informed and covered. See also guard.
REAR GUARD
Meaning of REAR GUARD in English
DOD English dictionary of military terms. Английский словарь военных терминов DOD. 2012