In comparison, Zhang Ning's Heavenly Spirit Flaming Rain wasn't any weaker than the Thunder Chariot. In terms of durability, it could last for six hours. However, the Lunu City's Yuan Shao's defensive barrier seemed to be specialized against fire. Zhang Ning's Heavenly Spirit Flaming Rain lasted for more than an hour, but the barrier remained undamaged.
Yang Rui decisively ordered Zhang Ning to stop. This was because after the Heavenly Spirit Flaming Rain smashed down, the Lunu City's defensive barrier turned from colorless to blue. It didn't show any signs of weakening.
This seemed to be a type of defensive formation specialized against fire. Otherwise, the Heavenly Spirit Flaming Rain wouldn't have been unable to wear down the barrier. Moreover, it seemed to be a type of reactive formation. Wherever the Heavenly Spirit Flaming Rain went, the defensive formation would become more obvious.
Because of these two situations, Yang Rui ordered Zhang Ning to stop attacking. Thinking about it carefully, Yuan Shao should have already been prepared. He used Zhang Ning's Heavenly Spirit Flaming Rain or Yang Rui's fire attack as a key defensive point.
Even the flying pet aerial bomb was one of the defensive targets. However, its power wasn't enough to attract Yuan Shao's attention. Or perhaps, it wasn't enough to trigger a reaction from the defensive formation.
At this time, Yang Rui was not interested in finding out the detailed reason because Zhang Ning, who had just given birth, was already a little pale from the cold. Even if she did not show it, Yang Rui, who was also in the sky, could feel the biting cold of the wind after the winter.
After the Heavenly Spirit Flaming Rain stopped, Yang Rui immediately escorted Zhang Ning back to the formation. If he didn't have a way to break through Yuan Shao's defensive formation, Zhang Ning's Heavenly Spirit Flaming Rain could only be used as a support method.
Yang Rui immediately called Guo Jia, the formation master, over. He described the situation of the Lunu City's defensive formation to Guo Jia. Combined with Guo Jia's observation, he quickly deduced that the Lunu City's formation was the Cang Lan Formation.
According to Guo Jia's introduction, the Canglan Tactical Array was a kind of tactical array that was not known by most people. It was only recorded in the books he read. It was said that it was passed down from the East Sea Dragon Palace and was used by the Chiyou Tribe to seal the volcanic crater.
However, Guo Jia was rather certain about the information about this formation because the formation's performance was exactly the same as described in the strange book. Whether it was the activated attribute or the performance after activation, it was completely in line with the few records of the Canglan Formation that had been passed down.
Even the Canglan Formation's performance in the face of aerial bombs and cloud ladders was in line with the records in the strange book. Before the aerial bombs ignited, they were not enough to trigger the formation, but after they ignited, they were already inside the formation.
As for the crossbow arrow attack on the cloud ladder, it was simply not within the range of the Canglan Array's defense. This also explained why Yuan Shao had set up other defensive formations in the city's grain warehouses and city walls while possessing the Great Azure Wave Formation.
Guo Jia didn't hide anything. The Cang Lan Formation was only effective against fire attacks. Although it wasn't too hard to break, it could only be broken from the inside. This required Yang Rui to arrange for people to enter the city.
Moreover, the people who entered the city had to follow special requirements and set up formation flags to break the formation. They were like lice on a bald head and would be easily detected. It was harder to achieve than sneaking in through the tunnel.
Under such circumstances, sneaking into the city through the underground tunnels seemed to be the most effective way to take down Lunu City. As such, Yang Rui had to be even more cautious when making his move. Otherwise, if he failed, there was no better way for him to deal with the situation.
Following this, Yang Rui started to prepare for the attack through the tunnel. The siege chariots were built at full speed. They were replenishing their fighting strength at the fastest speed possible. Moreover, once they were built, they would immediately appear on the battlefield and participate in the crossbow attack on Lunu City.
The siege chariots were very inconvenient to transport. If they wanted to transport them quickly, they had to break them down into parts and fold the main frame. When they were used again, it wouldn't save much energy compared to building a new siege chariot.
Therefore, siege chariots were usually made on the spot. Other than the time when the troops were unable to grasp how to make them in the army, Yang Rui once dragged this thing into battle. Later on, he would make it on the spot when he needed it, and he rarely used this kind of tool.
On the other hand, even if Yang Rui's troops made a large number of siege chariots in Lunu City, it would be difficult to use them in future battles. Unless they were in a few nearby cities, they could still be transported along with the troops.
However, at present, siege chariots were indispensable. Not only did they have the ability to divert attention during the underground battle, once the ambush failed, they would still have to use siege chariots in the next battle.
Not only did they make siege chariots, Yang Rui also ordered his troops to make many scaling ladders and black logs. Every time they were used, they would be placed in front of the formation. Because these two siege weapons would be used in a hand-to-hand battle, Yang Rui didn't really want to use them in a real battle.
Outside of the large scale siege weapons, the aerial bombs of the flying pet units never stopped harassing. Moreover, they were becoming more and more frequent. In comparison, even though aerial bombs didn't cause as much damage as the siege chariots, they clearly took up more of the defending troops' energy.
The flying pet units affected the entire Lunu City's defensive strength, while the siege chariots and crossbows were only local attacks. The range and momentum of the attacks were all different.
When all five to six thousand flying pet units moved out, they would cover the sky and cover the sun. Moreover, the aerial bombs wouldn't trigger a defensive reaction from the Azure Water Formation. The fireballs wouldn't cause much damage, but if they were left alone, a huge fire would be unavoidable.
As a result, once Yang Rui's flying pet units moved out, Lunu City's Yuan Shao City's defending troops would definitely become flustered. The places covered by aerial bombs were places they had to go to.
Moreover, the flying pet units didn't have much of a time limit. Whether it was day or night, they could fly and throw them out at any time. This kind of harassment made Yuan Shao's troops extremely annoyed.
Occasionally, Yang Rui would have Zhang Ning move out. Even though they were targeted by the Azure Water Formation and couldn't cause much damage, it could still be considered a group of harassment. At least it could create some panic.
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