ambuscade
Ambuscade (noun) means a surprise attack set up to catch an enemy off guard.
Etymology
Came into English from French embuscade, which came from Italian imboscata, the past participle of imboscare, meaning ‘to ambush’. This in turn came from Vulgar Latin *imbosco, meaning ‘I hide, ambush’ (see there for more), from Frankish *busk, meaning ‘bush’, from Proto-Germanic *buskaz, meaning ‘bush, heavy stick’. Compare ambush; more at bush.