(Foreword)

Cold ice can't break the water, and dead wood can meet spring again.

(Text)

The tiger shield of our army clung to the enemy's bow and arrow, like a tiger biting a sharp blade, and passed through the battlefield.

Seeing that victory was within reach, our faces showed the joy of victory, but I always felt that it was not so simple, why did the enemy have no other actions except for useless shooting, where did all the previous mechanisms go? I feel a headache...

"No...... No......" I was a little skeptical.

"What's the matter, Cheng Yin, are you happy that our army has won a big victory?" Zhao Yuyu was still immersed in joy.

"Why didn't the enemy make any other moves? Why don't they use it? Why do they look so calm? It's all so perverse. "I was puzzled.

"Cheng Yin, you are worried, they must have been frightened by our tactics. And even if they use the previous mechanism, we have a way to deal with it, so you don't have to worry. Professor Wu said.

"Yes, Cheng Yin, our army's tactics this time were unexpected, wouldn't it be good if we captured Yiling Pass like this?" Lin Yun also persuaded.

"The whole army is on the offensive!! Come on!!! Fast!!! General Wu could be heard shouting on the battlefield. Our army is getting closer and closer to the city walls.

No, victory came too easily, I haven't even figured out the last mechanism of Yiling Pass, so I can't win like this.

Enemy archers come and go, as if there is always an endless supply of arrows. Why do you continue to attack when it doesn't work? Could it all have something to do with the last organ? If that's the case, I'll have to think of the secret of the last mechanism as soon as possible, but all I have so far is a little memory...

Once upon a time, there was a general who led a large army to press in, passing through a city, and after a few days of fighting, the defenders of the city could no longer afford to continue to defend the city. In fact, he could have fled the city, but he didn't, and still led the remnants of his old army to stand on the tower. Its heroic spirit shocks the Quartet...

What the hell is this trying to tell me? My brain is a mess, and all the information keeps popping up in my head.

"Hurry!! Come on!!! I heard Cui Li shouting. I looked at the army on the battlefield and always felt that something was wrong... I always feel that their speed is getting slower and slower, and gradually it seems that they have reached a point where they can't move an inch... How so? No way? The enemy didn't use the tempest, right?

"Is it fun?" The 'mystery man' on the city wall laughed and said, "Isn't it interesting?"

"What the hell is going on? Why did our army stop advancing? Professor Wu seems to have realized this.

"Impossible? How so? Why did they stop? Hurry up!! Fast!!! Zhao Yuyu also became very excited.

"It's not that we don't want to move forward, it's that we can't move forward at all!!" Cui Li shouted.

Can't move forward...... How so? Is this the last organ we don't know about? Can an invisible force be generated?

"You don't have to guess, we didn't do anything other than shoot bows and arrows, can't you think of such a simple thing? How dare you lead troops to war? Not afraid to make people laugh off their big teeth? Hahaha!! "Every laugh of the 'mystery man' is incredibly annoying.

"Cheng Yin!! What to do? We can't move now!! Cui Li's shouting made me even more anxious, the situation is very critical now, if we don't find the problem as soon as possible, it is likely that the whole army will be wiped out.

"Professor Wu, how can this be? Is there something you haven't thought about in your design? Li Ruina asked.

"Could it be that the soldiers are holding tiger shields for a long time and are physically exhausted?" Lin Yun asked.

"It's impossible, I've tested it with Cui Li, and it's no problem to have a longer distance than this. It's impossible to be physically exhausted. Professor Wu ruled out this possibility.

The spears that the soldiers dropped in their hurry rolled down towards us......

I looked at the falling blade and seemed to understand something: "What's the round thing?" ”

"Something round? Is it okay to wear jade beads? Don't look at it as jade, but it's like a rock. Su Qinyu handed over a string of jade beads.

"That's it!! I took a jade bead. "I took the jade bead and threw it hard in the direction of the city wall.

"Cheng Yin, what are you doing here?" Lin Yun asked puzzled.

The jade bead fell far away, and sure enough, as Su Qinyu said, it did not break like a rock, but rolled down in our direction, and finally returned to my feet impartially.

"Sure enough, we didn't even notice it before..."I stared at Yiling Pass.

"Cheng Yin, didn't you find anything?" Professor Wu asked anxiously.

"So that's ......," Lin Yun seemed to understand a little.

"We haven't found out all along, in fact, the battlefield before Yiling Pass is not a plane, but an inclined plane." Mine said slowly.

"Bevel! No wonder the jade beads will roll back, so to speak, Cui Li and I have been testing the speed of movement on the plane, forgetting the test on the inclined plane, the soldiers are physically exhausted because they are walking on the inclined plane? Professor Wu said to himself.

No, at least not exactly, even the inclined plane is not completely immobile, at most it is difficult to move, there must be other reasons. I continued to ponder......

"What's wrong? This problem makes you confused, and you still want to attack Yiling Pass? Joke!!! Big joke!! "The 'mystery man' continued to make a lot of nonsense.

In fact, he said this just to interrupt my thinking. I didn't pay attention to his words, but thought about everything I hadn't thought of on the battlefield.

The army stopped in front of Yiling Pass, in a dilemma, I saw that the soldiers on the battlefield were in a dilemma, neither advancing nor retreating......

"Cheng Yin, think of a way." Zhao Yuyu didn't have the joy of the victory just now, but now he urged anxiously.

Why don't I think about it, thinking of the situation of General Wu and Cui Li on the battlefield, my heart is very anxious. I had to think of a way to do it as soon as possible.

The battlefield is raining arrows, and the enemy archers are still attacking our army, although it is useless, but after all, they can't move now, so it is not a long-term solution, and I don't know if the enemy has other plans, we must think of the reason as soon as possible. Once again, I was lost in thought...... I close my eyes and the answer is in my heart.

(End of chapter)