12th-14th century AD, Crusades period. Iron, just under 5” length. Flat triangular form on tapered bolster. Each side with two holes for binding incendiary material. The arrow was lit then fired into a castle or fortress. Both had considerable flammable components including thatched roofs as well as the remnants of animal feed and bedding. The extended blunt tip prevented it impaling, allowing it to fall to the floor or ground igniting the straw or hay. The opportunities for starting a fire were greatly multiplied by the use of many such arrows. This example was probably fired from a ballista owing to its weight and the range at which it was fired.