Crécy showed that static defensive archery could defeat armored cavalry.

Evidence

At the battle of Crécy, for example, English forces positioned themselves in terrain designed to concentrate fire from their archers onto the advancing French. Edward III chose a flat agricultural field flanked by forest and other natural obstacles, and ordered his men to dismount and wait, rather than advance on horseback. — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 428

Categorization

• XREF: Case in point of technology ‘cheating’ breaking the rules of engagement — mirrors cheap sneaky tactics