Anzhuang is built in front of the cornucopia, the main gate faces the bank of the Huanlong River, the left is the Lion Rock that looks up to the sky and roars, the right is the Longteng Daqingling, there is the stone dragon to help, the money and wealth are prosperous, and it is already a rich party at the end of the Yuan Dynasty. Anfu has a son, named Angeng, this person is familiar with the four books and five classics, and is very intelligent, but he is proficient in various martial arts and is good at riding horses and hunting. Deeply loved by An Gong. When he was fifteen or sixteen years old, he had red lips and bright teeth, thick eyebrows and big eyes, and a good demeanor, which was simply a talent.

Anzhuang raised many good horses, so he built a horse farm (that is, the current horse racing ground is named after it) at the foot of Fuhu Mountain, about two miles away, and the horse farm was guarded by about 50 people, and specially trained horses with good genes for hunting. Others are bred to consign goods.

One day the weather was fine, the stables let the horses go to the back of the long chong slope to graze, suddenly a green wild horse jumped out of the forest, looking up to the sky and neighing, the eyes were shining, the wind was under the hooves, running to mate with a mare who was grazing, the breeder did not dare to come forward to drink, about a few minutes later, the wild horse turned over the mountain and roared.

At this time, Young Master An Geng was about to pick a horse to hunt, and when he heard about it, he jumped onto the back of a red horse and chased after him. The road is overgrown with weeds, thorns are dense, but how can I help Young Master An to ride exquisitely, about half a pillar of incense kung fu, over the mountains, there is a cave in front of the sky obliquely, look at it, the ancient trees at the entrance of the cave are staggered, only to see the stone stalactites hanging in the air, there is a wild horse lying on the side of the cave, the eyes are slightly closed, the ears are erect, and the blue fur is very conspicuous. (This is the origin of the Mustang Cave at the foot of the rock)

When An Geng saw this, he was overjoyed and wanted to catch Xunzhi for his use. But knowing that this horse is not an ordinary thing, he does not dare to be easily alarmed. Dismount sideways, tie the horse in the dense forest, and walk lightly to the mouth of the cave behind the mountain. Seeing the dead vine hanging at the entrance of the cave for tens of meters, he pulled out a knife to cut off one of the golden old vines, gently pulled it up to make a slipknot, tied its shoulders, and then jumped to the weeping vine, slid into the air, aimed at the horse's head to cover, not biased just to cover the horse's head, the wild horse was frightened, panicked and jumped, An Geng said that it was too late and that was fast, flew down and rode on the horse's back, the wild horse suddenly kicked wildly with four hooves, and flew out of the cave in two or three steps. An Geng's ears heard the wind, the branches crackled on his shoulders, and he almost fell off the cliff several times, but An Geng couldn't let go, his hands clenched the horse's mane, and his legs clamped the horse's back. ran wildly like this for a stick of incense, and the wild horse was tired and exhausted, and he felt that he could no longer support the master on his back, so he had to stop kicking and let An Geng move forward.

When An Geng was overjoyed, there was a bubbling spring in the valley halfway through, which was flowing to a wide and deep dark river, and he was also hungry and thirsty, so he was ready to dismount and drink the spring water, who knew that this spring water was in the deep valley, he was worried that the wild horse would take the opportunity to escape, so he took the horse down to get water and drink it. Just arrived at the place of the spring, the wild horse suddenly changed his temperament, his hooves landed on An Geng, he reacted very quickly and grabbed the two horses' hooves, because the dark river around the perennial humid, mossy all over the ground, a stumbling man and horse fell into the dark river. (This is the current Nagachong well.)

Later, Anzhuang sent people to search everywhere to no avail, only to find a sachet at the mouth of the wild horse cave, and a shoe at the mouth of the dark river. An's family guessed that An Geng had an accident, and then grieved and handled the funeral for several days.