It's just dawn! Koji Zhisheng immediately convened the ministers of Gaochang.

"How is the damage to Gaochang City?" Koji asked with a gloomy face.

"Back to the king, last night the northwest wind was strong, Gaochang City was burned down hundreds of houses, thousands of Gaochang people have no fixed residence, and the palace is even damaged six palaces." A heavy report from a Gaochang official.

Spring itself was extremely dry, and after the gunpowder was ignited, the northwest wind took advantage of it, and the fire spread to many houses.

"Tang Jun is really too deceitful, and he maliciously set fire to Gaochang City!" A Gaochang general said hatefully. They didn't check for a while, but they were thrown gunpowder by the Tang army's trebuchet, which set fire to many houses.

However, the trebuchet is just that, what makes Gaochang even more headache is the hot air balloon in the sky, which can not only monitor the entire Gaochang City, but also set fire to the Gaochang City unscrupulously, even the Gaochang Palace was attacked by it, everyone has always thought that the Gaochang City Wall can protect them, and now the Tang Army has a hot air balloon can ignore the protection of the Gaochang City Wall and attack the city unscrupulously.

"Report!"

Suddenly, a soldier hurried to the palace, and said with a panicked face: "Qi Datang, this is the surrender letter that the Tang army shot into the city, if Gaochang refuses to surrender, the Tang army will burn Gaochang City." ”

"Burn Gaochang City!" In an instant, everyone in the entire Gaochang Palace was embarrassed, and now the weapons of the Gaochang city wall have been destroyed, and the city can be set on fire by the Tang army unscrupulously, and Gaochang's situation has greatly fallen into disadvantage.

For a while, the atmosphere of the entire Gaochang Palace was depressed, and they were all staring at Koji Zhisheng's body.

Ko Zhisheng gritted his teeth and said: "The Tang Dynasty's delusion to force Gaochang to surrender is simply wishful thinking, there is still a deep trench outside Gaochang City, and the Gaochang city wall is protected by five zhang, as long as the Tang army cannot enter the city, Gaochang City is always safe and worry-free, as long as it can hold out until the arrival of Gaoxi Turkic reinforcements, my Gaochang can still be preserved." ”

"What about the hot air balloon in the sky, if it is set on fire every day, I am afraid that it will not be long before Gaochang City will be burned down by it sooner or later." Hundreds of officials, civil and military officials frowned and said, Datang's threat is not untargeted, as long as there is a hot air balloon, Datang can unscrupulously set fire to Gaochang City, Gaochang has a dry climate, it is very easy to cause fires, Datang's move really hit Gaochang's death hole.

"Command every household, every house to fill its water tank, and be ready to put out the fire at any time." Koji Zhisheng said in a firm tone, although a hot air balloon is a threat, it is impossible to make Gao Chang succumb to this alone.

"Yes!" A group of Gaochang officials nodded and said, at this moment, Gaochang has not yet reached the end of the water, although the officials panicked, but they did not have much intention of surrendering in their hearts.

Outside the city of Gaochang.

The generals of the Tang army looked at the smoke still floating from time to time in Gaochang City, and then looked at the huge hot air balloon above their heads, and couldn't help but feel a burst of awe in their hearts.

"Fortunately, the hot air balloon belongs to us." The generals were lucky in their hearts, as friendly troops, Tang Jun was naturally very satisfied with the damage caused by the hot air balloon.

"The fire in Gaochang City has been extinguished!" Seeing the flag from the hot air balloon, Xue Rengui said loudly.

Hou Junji's face changed, he looked at Gao Changcheng, who was not moving, and said coldly: "It seems that Koji Zhisheng doesn't shed tears when he doesn't see the coffin. ”

With Hou Junji's order, one by one the soldiers of the Tang Army pushed the wheelbarrows that had been prepared, and the truckloads of dirt fell into the deep ditch outside Gaochang City.

The large-scale action of the Tang army naturally alarmed the Gaochang defenders defending the city, and they began to shoot the Tang soldiers who were pushing the carts with bows and arrows, but these wheelbarrows were protected by iron plates, and most of the large defensive weapons of the Tang army were destroyed, so they could not stop the Tang army's negative soil filling at all.

It will even attract a counterattack by the Tang army, and under the guidance of the hot air balloon, a series of trebuchets will attack Gaochang City, and for a while, the Gaochang defenders will suddenly suffer heavy casualties, and they can no longer stop the Tang army from filling in the earth.

Under the surveillance of hot air balloons, under the protection of trebuchets, and the rapid transportation of earth by wheelbarrows, the trenches dug by Gaochang City, which had high hopes to resist the Tang army, were filled in for several miles in one day, so that there was no hindrance to the Tang army's attack on Gaochang City.

A group of Gaochang guards saw the city of Pingchuan, and their faces changed greatly, so far, the Tang army and Gaochang City tightly only left the last layer of barrier, that is, Gaochang City, which is as high as five zhang.

What Gao Chang didn't know was that in the Tang Army's soil filling, hundreds of firearms supervisors were also carrying out earthwork and were secretly digging a tunnel leading to the city of Gaochang.

"This is the method of breaking Gaochang City in one blow that the ink sacrificial wine said, that is, digging a tunnel under Gaochang City, leading to Gaochang City, if so, then you don't have to work hard, Gaochang City imitated Chang'an City and built, every hundred steps there will be underground buried water tanks, wrapped in cowhide, and send special personnel to monitor, once the tunnel is found, it will be poured into the tunnel, or release poisonous smoke, when the time comes, everyone in the tunnel will die, unless it is a pre-dug tunnel, otherwise use the tunnel to capture the city, it can only be a dead end." When Hou Junji saw the actions of the firearms supervisor, he was immediately disappointed, and he felt like he had been deceived.

At that time, Mo Jiazi boasted about Haikou, saying that Gaochang City would be broken with one blow, and he thought that Mo Jiazi could really use gunpowder to blow up the city wall, and in the battle of Tiandi City, Mo Jiazi was only able to blow up the city gate, or kill and wound soldiers on the city wall, but the wall of Tiandi City was unscathed, although the power of gunpowder was good, but there were still 108,000 miles away from the effect he wanted.

"Mo Sacrifice Wine, if you can't break through Gaochang City, then why are you boasting about Haikou, if Gaochang doesn't surrender, how many soldiers' lives does Datang need to sacrifice to break through Gaochang City." Xin Fang'er accused.

The other generals also frowned, they had great hopes for the firearms supervisor, but the Mo family's behavior of digging tunnels made them disappointed, throughout the history of war, they knew that there were very few people in history who relied on digging tunnels to attack the city, and it can be said that this was already a failed tactic.

When Merton heard the generals' accusations, he did not get angry, but said aloud: "What if this tunnel does not lead to the city, but only to the city walls?" ”

"Under the city walls, how to attack the city?" Hou Junji couldn't help but be stunned, if they only reached the city wall, then the defenders in the city naturally had no choice, but how could they let the soldiers enter the city?

Merton said proudly: "The Firearms Supervision Council will put tens of thousands of catties of gunpowder under the Gaochang city wall, and the city wall can be destroyed with one blow, and the Tang army can naturally easily attack the city." ”

"Collapse the walls and storm the city!"

The generals couldn't help but breathe, since ancient times, the city wall is the most powerful defensive weapon in the world, if the gunpowder of the firearms supervisor can collapse the city wall, then the situation of the war in the world will change immediately, and the Mo family will once again change the offensive and defensive trend of the world.

What's even more surprising is that this method of changing the mode of war turned out to be changed by using the abandoned tunnel tactics, and the Mo family once again turned decay into magic.