The Mongols were expert mounted archers that used high stirrups which allowed them to shoot in any direction. They used composite bows ( 70 - 160 lb. draw weight ) and released the bowstring with a thumb ring that increased the killing range of the bow to 275 metres ( 300 yards.) The maximum range of their bows was about 550 metres ( 600 yards. )
Here is a lot of information on the Chinese/Mongolian Thumb Rings & their history. Hopt I didn't go back to far in history for you! If you want the invention of the invention of the modern release I couldn't honestly tell you.
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