At the banquet in the evening, Shi Lang learned from Zheng Zai that after the Japanese army entered the city, they captured a large number of strong men in the city and built a huge earthen fort on Zhengyang Mountain in the center of Pyongyang. After the earthen fort was built, a large number of Japanese troops were stationed there. The grain and weapons of the Japanese army were also stored in Pyongyang after the city was breached.

After the banquet, Shi Lang, Ye Ruliu, and Xie Yuan held a brief meeting in the room where Shi Lang and Xie Yuan lived, and the meeting decided that Shi Lang would explore Zhengyang Fort first in the evening. As for the next move, a decision will be made after Shi Lang comes back from spying.

Ye Ruliu was not worried that Shi Lang would go alone, and insisted on going with Shi Lang. Shi Lang did not agree. This operation is just a simple understanding of the general situation in Zhengyang Fort, and it is not an important action. In the case of an unknown enemy situation, he did not want Ye Ruliu to go out and take risks, and in this Pyongyang city full of Japanese troops, the target of his own action would be smaller, which would be more conducive to increasing the concealment of his operation. In the current situation, exposing oneself prematurely is not conducive to the completion of this reconnaissance mission.

Ye Ruliu couldn't resist Shi Lang, so she had to wait at home.

Zhengyang Fort was built on the slope of the south side of Zhengyang Mountain. Although Zhengyang Mountain is called a mountain, it is actually a high-lying hillside. From a distance, Zhengyang Fort looks like a huge oval wooden barrel on the hillside at night.

Shi Lang crouched behind a rock, picked up a small pebble from the ground and threw it up the hillside. The stones fell to the ground, and there was no movement.

Shi Lang tightened his waist and quickly crawled forward, coming to a tree about ten meters away from Zhengyang Fort, he first quietly listened to the movement in the fort not far away, and then climbed to the top of the tree.

The entire Zhengyang Fort was unobstructed under Shi Lang's eyes. The earthen fort runs east-west. There is a stone arch under the round wall on the south side of the fort, and the wooden gate with cast iron trim is tightly closed. The wooden gate faces a long narrow stone path down the mountain. The round wall is about 10 meters high, and the walls are all made of bluestone. At the top of the fort there is a circular aisle, and the outer wall of the aisle is a concave and convex parapet. The top of the stone fort enclosed by the inner wall is covered with gray tiles. There is a corner tower in each of the four directions of the southeast, north, and west of the wall, and you can vaguely see that there are Japanese samurai guards on the corner tower. The annular walls of the corner towers and earthen forts are densely covered with black holes, shooting holes and lookout holes.

Shi Lang descended under the tree, bowed down from the grass on the hillside, and gently came to the stone wall on the north side of Zhengyang Fort, near the corner tower on the east side.

It was midnight, and a crescent moon appeared and disappeared in the clouds. A faint moonlight slanted down from the sky on the other side of Zhengyang Castle, hiding Shi Lang in the huge shadow of Zhengyang Castle. From time to time, there was a faint sound of insects chirping in the grass in front of him.

Shi Lang leaned his back against the stone wall, looked up and carefully observed the corner towers on both sides of his body, and there were people shaking their heads in the two corner towers.

Shi Lang took out the eavesdropping device he was carrying, Wenjin, from his backpack, and then squatted down and gently inserted the trumpet-shaped Wenjin into the crack in the stone wall, listening quietly. There were muffled voices in the direction of the corner towers on both sides. There was no sound in the circular aisle of the stone fort directly above Shi Lang, which indicates that the Wa people probably only arranged fixed posts in the corner towers, and there were no mobile posts in the circular aisles on both sides of the corner towers.

In fact, this Wenjin was originally a kind of eavesdropping device used by the ninjas of the Japanese Kingdom, and one end of it could be inserted into the wall, because the gold texture is relatively soft, and it can be tightly combined with the material in the cracks of the wall such as sand. By placing their ears on the other side of the sniffer, they can hear the sound of the house. If it is not convenient to eavesdrop at close range, the real eavesdropping master can also use a thin steel wire to connect the Wenjin inserted into the wall with another Wenjin, and the eavesdropper can rely on the conduction of the two Wenjin and the steel wire at a distance to eavesdrop on the movement in the wall.

Daming Jinyiwei also has many of its own eavesdropping devices, but compared with Wenjin, whether it is the convenience of carrying or the actual use effect, it is a little damaged. In order to better complete the task for his subordinates, Luo Shiyin specially found a group of craftsmen to imitate a batch of various weapons used by Wenjin, Kunai and other Japanese ninjas, and configured them to his subordinates.

Shi Lang listened patiently for a while, and after making sure that there was no enemy standing guard above his body, he stood up, and then, using the uneven places and gaps in the stone wall, he grabbed his feet and climbed up.

If you use the Flying Tiger Claw, although the climbing speed can be increased, the sound made by the Flying Tiger Claw may alarm the sentinels in the corner tower. Although kunai can improve the safety of climbing the wall, the speed is slow, and Shi Lang carefully observed the stone wall of Zhengyang Fort, the wall is uneven and the gap is large, and there is absolutely no problem in climbing with bare hands.

Inside the Jinyi Guard, ordinary masters can skillfully use climbing tools such as flying tiger claws. The reason why Shi Lang is called the "Iron Arm God Ape" is that he can not only use various climbing tools proficiently, but also has a very strong ability to climb with bare hands.

I saw Shi Lang's body clinging to the stone wall, his hands and feet at the same time, his whole body was as agile as an ape, fast as a civet cat, and in less than a minute, Shi Lang climbed to the top of the stone wall about ten meters high. He climbed the recess of the parapet wall with both hands, carefully observed the movements of the sentries in the corner towers on both sides, and then saw the right time, with his hands and feet, his body gently vertical, and landed in the circular aisle on the stone castle.

The aisle is about three meters wide, and on the inner wall opposite the parapet, there are ventilation windows and small wooden doors at intervals of about two meters. It was pitch black inside the window, and I couldn't see it clearly.

Shi Lang shrewdly avoided the sentinels in the corner tower and walked around the circular aisle. Through observation, Shi Lang roughly estimated that there were about 200 ventilation windows and small doors on the inner wall. Well, the circumference of this circular stone fort should be around four hundred meters.

Through the cracks in most of the small wooden doors, the sound of snoring can be clearly heard. Based on this, Shi Lang judged that the space inside the door might be the dormitory of the Japanese soldiers.

The four corner towers are flanked by two staircases that lead to the following. Shi Lang descended gently from one of the stairs. The staircase is not long, there are about ten steps or so.

At the bottom of the staircase is another circular aisle. Unlike the top aisle, this level is much wider. The exterior walls of the aisles are densely covered with holes and small lookout holes. The doors and windows on the interior walls are much farther apart, and the doors and windows are larger than the upper floor.

Shi Lang hid at the corner of the stairs and patiently observed for a while, and when he saw that no one was moving, he took out the Wenjin again and inserted it into the gap in the inner wall to listen. There was no movement in the room.

Shi Lang decided to go into the room to take a look, he put Wen Jin away, took out a thin-bladed short knife from his backpack, gently pried open a window on the wall with his feet, and climbed into the house.

This is an arsenal of Japanese soldiers. The space inside the house is very large, and the ground is regularly stacked with weapons of various colors. Shi Lang made a general inventory, and most of the weapons of the Kunai Japanese army were cold weapons such as spears and katanas. In terms of firearms, there were only a small number of single-shot guns and a few iron cannons.

Shi Lang climbed out of the window and closed the window. He didn't want to go into any other room to look at it. It can be inferred from the dense holes and cannon holes on the outer wall of the corridor that the room on this floor should be mainly an arsenal of Japanese soldiers. These things don't make much sense to look at or not, because compared with the advanced firearms and equipment of the Ming Dynasty at that time, the firearms of the Japanese army are simply insignificant.

Shi Lang found a staircase going down, ready to continue down to the lowest level of the stone castle. Based on the height of the stone fort, Shi Lang judged that it should be a three-story building.

When Shi Lang went down to the bottom of the stairs, he found a locked iron door blocking the way. Shi Lang was not prepared to break through the door, because the main purpose of entering the city this time was to reconnoiter the number of Japanese troops, and the night visit to Zhengyang Fort was just to get a general idea of the situation and see if he could find clues to the number of Japanese soldiers, and the exact situation in Zhengyang Fort did not have to be clarified. Besides, it would be unwise to alarm the enemy prematurely in the absence of the main task.

Thinking of this, Shi Lang carefully went up the stairs to the top of the stone fort, avoiding the enemy's sentry posts, and went down from the place where he ascended the fort to the bottom of the fort.

When Shi Lang returned to the "Xiangxiang Cloak Shop" along the same road, Ye Ruliu was sitting on a chair in the living room on the second floor worriedly, and she had been waiting for Shi Lang to return safely.