ambuscade \AM-buh-skayd; am-buh-SKAYD\, noun:
1. An ambush.

transitive verb:
1. To attack by surprise from a concealed place; to ambush.

Ambuscade comes from Middle French embuscade, from Old Italian imboscata, from past participle of imboscare, "to ambush," from in, (from Latin) + bosco, "forest," of Germanic origin.

The storm is distant, just the lights behind
The eyes are left of lightning's ambuscade.
-- Peter Porter, "The Last Wave Before the Breakwater"