ambush
noun
VERB + AMBUSH lay, prepare, set up The soldiers set up an ambush on the road.| lie in, wait in The soldiers lay in ambush for the enemy troops.| carry out, stage They staged an ambush on an army patrol.| be caught in, run into, walk into We ran into an ambush in the valley.
AMBUSH + VERB take place
PREP. in an/the ~ Twelve menwere killed in the ambush.| ~ on an ambush on an army patrol