The meaning of Ambush in the Bible
(From International Standard Bible Encyclopedia)

am'-boosh ('arabh, "to set an ambush"; ma'arabh, "an ambush"): A military stratagem in which a body of men are placed in concealment to surprise an enemy unawares, or to attack a point when temporarily undefended. This stratagem was employed successfully by Joshua at Ai (Jos. 8). Jeremiah calls upon the Medes to "set up a standard against the walls of Babylon, make the watch strong, set the watchmen, prepare the ambushes" (Jeremiah 51:12).

See more on the meaning of Ambush in the Bible:
Ambush {Easton's Bible Dictionary}

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