designed either to extend range or as a cheaper and simpler alternative to the broadhead. In a modern test, a direct hit from a hard steel bodkin point penetrated a set of fifteenth-century chain armour made in Damascus. However, archery was minimally effective against plate armour, which became available to knights of fairly modest means by the late 14th century. Judo points have spring wires extending sideways from the tip. These catch on grass and debris to prevent the arrow from being lost in the vegetation. Used for practice and for small game. Broadheads were used for war and are still used for hunting. Medieval broadheads could be made from steel, sometimes with hardened edges. They usually have two to four sharp blades that cause massive bleeding in the victim. Their function is to deliver a wide cutting edge so as to kill as quickly as possible. They are expensive, damage most targets, and are usually not used for practice. Two main types of broadheads are used by hunters: the fixed-blade broadhead and the mechanical broadhead. While the fixed-blade broadhead keeps its blades rigid and unmovable on the broadhead at all times, the mechanical broadhead deploys its blades upon contact with the target, its blades swinging out to wound the target. "There are three requirements to making a broadhead. 1. It must be wide enough to cut through tissue to produce a quick, clean kill. 2. It must be narrow enough to penetrate well. 3. It must be of a shape that can be sharpened well." A few models known as hybrid broadheads have both fixed and replaceable blades, most often two relatively small fixed blades and two longer mechanically opening blades. The mechanical head flies better because it is more streamlined, but has less penetration as it uses some of the kinetic energy in the arrow to deploy its blades. Three-bladed, trilobate, or Scythian arrowheads appears in regions under influence of the Scythians and ancient Persians. It was the type normally used by the Achaemenid army. Target points are bullet-shaped with a sharp point, designed to penetrate target butts easily without causing excessive damage to them. Field points are similar to target points and have a distinct shoulder, so that missed outdoor shots do not become as stuck in obstacles such as tree stumps. They are also used for shooting practice by hunters, by offering similar flight characteristics and