An ambush is a surprise attack from a concealed position on a moving or temporarily halted enemy. An ambush is a long established military tactic in which an ambushing force uses concealment to attack an enemy that passes its positionoun Ambushers strike from concealed positions such as among dense underbrush or behind hilltops. The tactic is generally used to gather intelligence or to establish control over an area. Ambushes have been used consistently throughout history, from ancient to modern warfare. An ambush predator is an animal who uses similar tactics to capture prey without the difficulty and wasted energy of a chase.

Ambush! is a man-to-man wargame developed by Avalon Hill. It was released under Avalon's Victory Games label and was developed by Eric Lee Smith and John Butterfield. In 1984, Ambush! won the Origins Award for Best 20th Century Boardgame of 1983. It has been out of print since Avalon Hill was disbanded in 1998.