The border stockade was destroyed overnight, and the iron kites stepped on the wall. The crossbow arrows hit the iron armor like ringing a bell - they cannot penetrate. Li Hong's father died on the wall with his eyes open. Twenty years later, Li Hong, a crossbow maker from the border area, had his crossbow fired by the craftsman, and his dead father was also humiliated. He didn't argue, and just said one sentence: I want to build a crossbow that can shoot through iron armor. He picked an ox's horn from the scrap heap and made it into an arm with three layers of glue; he strung up his pedals and took three hundred and forty steps to pierce the armor with an arrow. In the competition at Zhoumen, the official was defeated; in the test at Yujinyuan, Yukou personally praised "this is a sharp weapon." As soon as the divine arm came out, the world was shocked. Jin Wushu sighed: The weapons used in the Song Dynasty are more wonderful than the divine arm bow. The bow can be passed down for hundreds of years,
