Rere·ward n.  The rear guard of an army. [Obs.]
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  Rereward
     (Josh. 6:9), the troops in the rear of an army on the march, the
     rear-guard. This word is a corruption of the French
     arriere-garde. During the wilderness march the tribe of Dan
     formed the rear-guard (Num. 10:25; comp. 1 Sam. 29:2; Isa.
     52:12; 58:8).