How did China defeat the enemy soldiers with wooden horses in ancient times?

The imperial court appointed Pei Hangjian, the minister of rites, as the chief marching officer of Dingxiang Road, and led 300,000 troops to beg. When Pei Hangjian arrived in Shuozhou, he learned the reason of Tang Jun's repeated wars and defeats, and prepared 300 grain wagons, each with five warriors, armed with knives and crossbows, and sent hundreds of weak soldiers to transport them, laying good soldiers in various dangerous places. When the rebels saw the grain convoy, they really robbed it again. The grain soldiers made a little resistance and abandoned the car and fled. The rebels seized the grain truck. Escort to a place with aquatic plants, untie the saddle and release the horse. Just as he was about to get food from the car, the brave man lying on the car suddenly jumped up and the rebels fled in panic. Ambush was everywhere, and the rebels were captured and killed.