10th-12th century. Crusades period and the period of siege warfare in general, before the development of effective gunpowder. Iron, 5 3/8 with forged seam conical socket and elongated shallow diamond section leaf shaped head. The section, specifically made for penetrating wood superstructure of forts or castle interior buildings in contrast to the thick bolts which were intended to penetrate armor and masonry. This example, of course, would kill an armored soldier as well. These were also used with incendiary material, oil soaked rags, bound behind the head which, light, could set wood or thatched roofs afire. The head was mounted on a large shaft and fired from a balista or large stationary cross bow (arbalese) which allowed for adjustment of trajectory based on previous shots as with artillery. Excavated with losses, primarily to the socket.