am·bush / ˈamˌboŏsh/ • n. a surprise attack by people lying in wait in a concealed position: | terrorists waiting in ambush. • v. [tr.] (often be ambushed) make a surprise attack on (someone) from a concealed position: they were ambushed and taken prisoner by the enemy.

Ambush ★★★ Rukajarven Tie 1999

Young lieutenant Eero is serving in the Finnish Army in 1941 pursuing Russian troops along the border. During his mission, Eero is able to briefly spend some time with his lovely fiancee Irina but must soon leave to go on a recon. He receives word that Irina has been killed by Russian soldiers and seeks revenge on any Russians he finds—turning from innocent soldier to dehumanized killer. Co-writer Tuuri adapted from his novel. Finnish with subtitles. 117m/C VHS, DVD . FI Peter Franzen, Irina Bjorklund, Kari Vaananen, Kari Heiskanen, Taisto Reimalvoto; D: Olli Saarela; W: Olli Saarela, Antti Tuuri; C: Kjell Lagerros; M: Tuomas Kantelinen.

Ambush

a group of troops of persons concealed or lying in wait for their prey.

Examples: ambush of amber coloured darts [referring to a lady’s hair], 1592; of envy, 1751; of error, 1852; of tigers; of widows—Lipton, 1970.

ambush vb. XIV. ME. embushen — OF. embuschier :- Rom. *imboscāre lit. ‘put in a wood’, f. in IM-1 + *boscus wood, BUSH1.
So ambush sb. XV.