In those days, there were many ways to build a city. The more rudimentary one is to build a camp based on wood, and then apply mud and air dry to reinforce. If there is a little bit of resources and time, the city will be built in a combination of earth and stone structures or wood and stone structures. Of course, the most classic is the Ming Dynasty built the city of Nanjing, relying on marble masonry and glutinous rice juice to build an amazing giant city - but Yu Qiuping certainly did not have such conditions.

Another common way to build a city is to use the inner layer of rammed earth as a wall base, and use bricks and stones on both sides to wrap the soil layer inside to become a city wall. In this way, Yu Qiuping believes that it can also be used to build the castle tower.

And this is also the premise of all the plans of Yu Qiuping.

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"If you have the courage to do so, please make it clear to Your Highness," Naoe Tadahei asked inexplicably, "What is the connection between the construction of the castle and the assassination of Oda Nobunaga?" ”

"That's right, you guys listen to me explain slowly." Yuqiu took a breath and said, "According to our tradition here, if a retainer goes to build a city in the Chong area, then all the construction of the city will be handed over to the retainer to be responsible. The lord, on the other hand, will obtain the right to use the city before it loses its strategic significance, and will be stationed in the city to command. ”

"We're going to build a castle in Sumamata in the territory of Mino, and we're sure we'll only be able to build a proposed civil structure at the beginning." Yu Qiuping said as he put his hands behind his back and slowly paced around the house, "But after repelling a possible attack from the Saito family, we will have a chance to renovate this castle." ”

"Let's say, build a beautiful castle tower made of earth and stone." Yu Qiuping paused, and said in a low voice: "And if you want to attack Ximinon, it is very likely that the lord will take his cronies and guards to personally climb this exquisite castle tower to watch the battle situation." ”

"The conditions required for combustion are combustibles, air and a certain temperature." Yu Qiuping recalled the knowledge in the school classroom in his previous life.

"If we mix a large amount of flammable materials such as gunpowder, sulfur, charcoal, straw and cotton into the soil embryo between the two layers of wall tiles, then make the inner wall tiles a little looser to ensure air circulation. Transform the entire castle tower into a large powder keg. ”

"When the lord enters the castle tower with a group of important people and cronies, then light the fire..."Yu Qiuping said this, and did not say any more, but set his eyes on the three subordinates. Naoe Tadahei was already in a cold sweat, Sanada Masayuki was also a little trembling, and even Amano Keitoku, who was usually calm and calm, was frowning at the moment.

The reason why Yu Qiuping came up with this method was inspired by the fact that in the history of his previous life, Akechi Mitsuhide barbecued Oda Nobunaga in Honnoji Temple. At that time, Oda Nobunaga had only a few hundred people with him, and he lived in Kyoto's Honnoji Temple, which he thought was safe. The rebellious Akechi Mitsuhide came from Tanba Province and surrounded the Honnoji Temple, and the last of the overlords also fell in the fire.

I can also imitate the change of Honnoji Temple and come to the change of Sumamata Castle.

I will perfectly replicate the tragedy of the late Imperial Highness the Governor being burned to death in Narumi Castle on you. However, I won't give you any chance to fight the fire or escape, and I'll just let the castle tower explode.

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"This law... It's really... After listening to Yu Qiuping's plan, Naoe Tadahei stumbled to make a comment, but couldn't find a suitable word anyway.

It's no wonder that Naoe Tadahei thinks so, Yu Qiuping's plan is too crazy. Historically, no one has ever built a castle tower made of gunpowder to explode and assassinate. The plan sounds unrealistically crazy.

"Too sensational, or too fanciful?" Yu Qiuping helped him make up two words, and after seeing the latter nod slightly, he continued to speak: "But theoretically, it is indeed feasible. Don't you believe in the power of gunpowder? Aren't all sensational plans also come up with people? It's a way to get it in front of you, and without it, do you have a better way? It can also be raised. ”

Naoe Tadahei and Amano Keitoku were stunned for a moment and fell into deep thought. For a long time, they had to admit that this plan, although appalling, was indeed feasible.

"Maybe you could consider sending a ninja as an assassin to assassinate Oda Nobunaga?" Naoe Tadahei proposed.

"According to our intelligence, Oda Nobunaga is heavily guarded on weekdays, and there are many guards and ninjas guarding in the light and dark, so I'm afraid it will be difficult to succeed." Sanada Masayuki vetoed, "Unless you use overwhelming force to attack, it is absolutely impossible to assassinate him by relying on one or two assassins." ”

"Then maybe you can fight back on the battle formation and take advantage of the chaos to kill him?" Tadahei Naoe once again threw out a plan.

"It's too difficult, the battle situation is changing rapidly, unless it's a war that I can clearly grasp the direction of, it's too complicated to deploy it in advance," Yu Qiuping shook his head and said, "Besides, the success rate is not as high as if I blew up the castle tower." ”

"But His Highness's method is easy to leak." Naoe Tadahei still reminded with some unease, "First of all, we must get so many flammable materials, and we must use them for the construction of the city, and the workers who build the city will always see it." ”

"Are flammables, those gunpowder sulfur or something, we have already bought a lot of them for the training of the Iron Artillery Team, don't worry." Yu Qiuping nodded and said, "But the problem you said the craftsmen would see when building the city... But there are risks. ”

"It's not difficult." Amano Keide said coldly, "Let's build a castle in the territory of Mino on the other side of the Kiso River, and it's not Owari under the control of Oda Nobunaga, relying on the ninjas to guard the surroundings, we can avoid Oda Nobunaga's ears and eyes." The construction of a small castle tower was not a huge task, and it was not necessary to employ people as workers on a large scale, but only to mobilize reliable and unwitting old brothers to build the castle with earth that had been mixed with gunpowder. Even if they see that there is something wrong with the composition of the soil, they will not chew their tongues if we give them a silent order on the grounds that the construction of the city is a secret matter. ”

"As for mixing a large amount of gunpowder into the earth, let the ninja below do it." Sanada Masayuki added on the side, "They will definitely not leak secrets easily, and I will not tell them the purpose of these soils, so I hope Your Highness can rest assured." As long as the two steps of mixing gunpowder into the earth and building the city with earth are separated, no one will guess the purpose. ”

Seeing that the risk problems were eliminated one by one, Naoe Tadahei was still a little uneasy. He swallowed his saliva and hesitated for a moment, but finally spoke: "But to make such a conspiracy to detonate the castle tower, such a rebellious thing... I'm afraid it will damage His Highness's consistent good reputation. Our brothers in Chang Panbei know that His Highness has done such a thing, and I am afraid that they will also be very troubled. ”

Naoe Tadahei's words made Yu Qiuping shake a little. But after he was stunned for a moment, he immediately put his hand into his clothes and grabbed the rib cha that Sena Shijun had left for him. The cold touch spread from the palm of his hand to his whole body, immediately suppressing his hesitation and hesitation.

Over the years, whenever his goal of revenge has wavered, this unsheathed rib will be his spiritual pillar. His Royal Highness Sena exchanged his life for his own life, just so that he could complete what he didn't finish and take revenge! It's not for him to live comfortably in the enemy's house!

"I understand." Yu Qiuping looked at Naoe Tadahei solemnly and nodded miserably, "But I must not let His Highness Sena die in vain." I must avenge His Royal Highness's revenge. ”

"Does Your Highness really want this..."Naoe Tadahei was still a little reluctant to accept this plan, "Your Highness... Maybe Oda Nobunaga himself will die in battle one day, and there is no need for His Highness to risk the world's condemnation and kill the king. Even if we send assassins to assassinate us, we can justify that we didn't do it, but if we detonate the castle tower so directly, Your Highness will become the target of a thousand people! ”

"Don't say it, I'll see what you mean." Yu Qiuping shook his head resolutely, "But this is the best opportunity I can grasp now, and I can't afford to fail." Otherwise, under the Nine Springs, how should I face His Royal Highness Sena, and how should I face His Royal Highness the Governor? ”

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On May 1, Oda Nobunaga could not wait to order the assembly of troops throughout the territory to prepare for a large-scale attack on the Saito family. However, the Saito family, which had an alliance with the Rokkaku family, moved out at this moment Ashikaga Yoshiaki, a general who was attached to the Rokkaku family. At their request, Ashikaga Yoshiteru sent emissaries to try to mediate the war between the Saito and Oda families. However, Oda Nobunaga, who was complacent about to swallow Mino at all, ignored the general's messenger and rejected it in one gulp.

On May 9, the Oda family completed the all-collar assembly. Oda Nobunaga personally led an army of 12,000 troops to Niwa Prefecture, where he collected ferries and timber on the southern bank of the Kiso River to build a pontoon bridge to cross the river. And the Saito family realized that Oda Nobunaga was not good at coming this time, and it didn't look like a small fight. The Nishimino clan jointly dispatched troops, and in conjunction with the troops of the Saito family, they gathered a heavy army of 10,000 men and stationed them in the prefecture on the north bank of the Kiso River. The main forces of the Oda family and the Saito family face each other from Kono Island on the Kiso River.

At the same time, the Oda family's Einsatzgruppen in the Mino area also launched an operation. The Oda Army, of which Mori became the commander-in-chief, gathered a force of nearly 3,000 men and operated on the east side of the Saito family, threatening the security of Inabayama Castle. Their presence forced the Saito family not to dare to invest too many troops on the beachhead on the banks of the Kiso River, but had to divide a part of their forces to cover the defense line of Inabayama Castle.

And just when it was confirmed that the main force of the Saito family had been attracted to the central media, Yu Qiuping also quietly launched an action. The main forces of the four small wealthy clans on the other side of the strait have also been transferred to the Sino-American battlefield, and there may be no way to help Yu Qiuping. Kinoshita Hideyoshi's plan to seek help from Kawanami in history is estimated to be impossible to achieve in this lifetime. However, Yu Qiuping didn't care. Because he is located in Yeli County, he is himself in the upper reaches of Sumamata. Having already stockpiled a large amount of wood, he immediately sent a large number of auxiliaries to weave rafts on the banks of the Kiso River in the early hours of the morning, and let the soldiers and auxiliaries carry torches down the raft. Under his leadership, the whole army of Chang Panbei took advantage of the moonlight and went straight to Sumamata.