An ambush or sudden attack, especially one carried out by soldiers or warriors against an unsuspecting enemy.
From Old French 'embusshe' or 'embûche' (ambush), itself from 'em-' (to put in) plus 'busche' (bush). The word traveled through French to English, with 'ambash' being an archaic variant form.
In medieval and ancient warfare, an ambash was actually one of the most effective tactics—hiding soldiers in forests or around corners meant you could defeat a much larger force without a pitched battle, which is why military leaders studied this tactic carefully.
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