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Rereward

the troops in the rear of an army on the march, the rear-guard (Josh. 6:9)

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; compare 1 Sam. 29:2; Isa. 52:12).

Translated from the Hebrew 'acaph (a primitive root meaning to gather for any purpose; hence to receive, take away, i.e. remove (destroy, leave behind, put up, restore, etc.); withdraw.