The propelling weapon with the chord was constantly improved until it began to resemble the commonly known crossbow. gastraphetes, also known as the abdominal arch drawing R.M. Preparing it for the shot was much longer than a regular bow, but the range and punching strength compensated for this disadvantages. Gastraphetes was too heavy to shoot from the hand, so supports were used or it was leaned against the walls. After the string was tensioned, an arrow was inserted into the guide. This bow, called the gastraphetes, was strained not only by the hands, but also by the whole body, leaning the slider on the ground, and the bent butt on the stomach. In safety element a trigger was also provided. It was a weapon operated by one soldier, with metal arms with a chord tensioned by means of a slider pulled in a guide and secured against returning by means of a simple ratchet mechanism. In ancient times metal bows were also used. The elastic tendon stretched as the string was spread, while the horn plates were compressed, so both materials increased the power of the shot. The ancient Greeks used bows made of one flexible piece of wood, but Cretan archers already used composite bows, consisting of a wooden shaft on which the tendon was applied from the convex side and the horn plates from the concave side. Along with the development of martial art, their design was improved by using more and more new materials, allowing for increased strength and range. One of the simplest and oldest weapons used during sieges were bows that used the natural elasticity of wood.
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