In a covert at the city not far away, Zhang Yu, the lieutenant of the royal palace, sneaked in. Several people inside were ready and looked at the flood outside the city through the observation window.

On the water surface, many floating objects suddenly appeared. Each floating object looked roughly similar, but the colors were slightly different.

Each floating object is a specially made sky-bombing thunder, code-named "Anchor Thunder", which is pre-arranged outside the city and buried on the surface of the ground. If there is a large amount of water, it can float up, and it will not float away with ropes.

The anchor thunder is detonated by electricity, and it is prevented by enemy ships approaching the city walls through the flood to cause a "rumbling". In the bunkers on the top of the city, there are more than 30 people who control these anchor thunders.

One person and one thunder, the dedicated line will explode, and you will never miss it!

Zhang Yu looked at the water through the small window and asked nervously: "How about it, won't you get confused, right?"

"Boss, absolutely not!"

"Boss, those anchors and thunders are connected to each other. As long as the boat passes through the middle, it will inevitably lead the anchors and thunders to both sides. When the switch is closed, none of them will be able to escape!"

"You guys save some money... There is not much gunpowder in the city. You may not be able to make up so many anchors next time. If you can, you can save..."

Zhang Yuxu was nagging, he was not stingy, because the "rail cannon" consumed gunpowder too exaggeratedly, and the "anchor thunder" was not inferior. In order to ensure the long-term need for defending the city, they had to save some gunpowder.

Although Anzhou had tried its best to transport gunpowder, the stock reserves in Xuanhu City were still insufficient. These anchor thunders were also shouldering the heavy responsibility of "land mines", and basically one less was used.

However, no one had time to pay attention to him, and they all stared at the enemy warships approaching the water.

Outside, Yin Shi Master looked at the monster eggs and monster chickens that were constantly throwing on the altar, and really wanted to rush up and pull them off, but he couldn't do so. He could only pick up the bow and arrow silently and prepare to shoot arrows at the enemy warships approaching the city.

A warship rushed towards him in front of him, only a hundred steps away from the city. Just as Yinshi Master was bent his bow and arrow, the ship suddenly exploded on the starboard side, and a pillar of water soared into the sky.

The sudden explosion caused the ship to tilt quickly and then sank into the water. The Yinshi Master was stunned as if he was seeing a ghost. Not long after, another enemy warship sailing towards the city was sunk by an inexplicable explosion in the water.
Chapter completed!