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Before it got dark, under Lu Bu's careful arrangement and planning, a Maxim heavy machine gun and two Type 99 light machine guns had been mounted on the arrow towers of the four city gates of the not-so-lofty city wall of the ancient city of Machi, with several baskets of grenades placed next to them. Each arrow tower was also equipped with more than a hundred archers and soldiers responsible for throwing grenades.

Li Su, Zhang Yang, and a group of carefully selected new soldiers from Jiuyuan County, who had undergone Lu Bu's intensive training, served as machine gunners, throwers and archers respectively. Except for a small number of people who took turns to replace the guard posts, most of them were lying in the arrow tower sleeping or closing their eyes to rest, conserving their energy and waiting for the opportunity.

The defensive forces in Jiuyuan County remained the same as before, just as Lu Bu requested, maintaining a state of readiness for war while being relaxed on the outside and tense on the inside.

The walls of the ancient city of Machi are all built with rammed earth, with stone as the foundation, covered with rammed earth, and glutinous rice juice used to assist in compacting the loess. The shape is simple and simple, very strong and durable, and is no less than modern concrete structures.

It is said that after the city wall was built, Lu Bu's grandfather Lu Hao once organized a special team to do a test. Under the heavy blows of knives and axes of different strengths, only a white mark was left on the glutinous rice earth wall, and there was no sign of collapse.

The entire wall of the ancient city of Machi is divided into two halves, north and south, with four gates facing southeast, northeast, northwest and southwest respectively. Outside each gate there are stone bridges, gatehouses, moats and other corresponding supporting facilities.

At this time, Lu Bu was walking on the city wall of the ancient city of Machi, checking for omissions and gaps during his inspection, while thinking about how to better eliminate the Huns' vitality.

Finding that the arrow battlements and firepower equipment of the towers on the city walls were still a little lacking, Lu Bu placed several heavy artillery and mortars on the northwest lookout tower, and thought of a contingency plan in his mind. If the Huns retreated, he could use the transmission function of the space-time router system to seize the favorable combat terrain before the Huns fled, and use other spare high-efficiency firepower weapons or armored vehicles to effectively block the Huns' fleeing. This time, the Huns must not return, to avenge his father Lu Liang and other soldiers who died on the battlefield, his mother's family who suffered innocently, and his fellow villagers. In addition, the secret of hot firepower weapons must not be known or spread by the Huns, and the Huns must be prevented from responding to such hot weapons as much as possible, so as to achieve a surprising victory in the future battle against the Huns.

It was late at night. When the bell of midnight rang, a large group of more than 5,000 Hun cavalry organized by Hubdusai appeared hundreds of meters away from the ancient city of Machi. Lu Bu, who was on the city wall of the ancient city, felt the vibration and resonance caused by the charge of the large group of Hun cavalry.

The passionate, sharp and loud sound of the horn pierced the sky and darkness of the ancient city of Machi.

The Xiongnu cavalry began to run faster and faster, like a sprint. First came the roars of the Xiongnu people and the sound of horns, then the sound of galloping horses' hooves and neighing horses. Gradually, these sounds intertwined together to form a huge roar that was truly earth-shattering.

The ground nearby also seemed to begin shaking. Lu Bu, Li Su, Zhang Yang and the new army soldiers on the city wall also seemed to feel the city wall shaking.

At this moment, the Hun cavalry was like a hurricane that suddenly blew up from the flat ground, like a tsunami, a landslide, an overwhelming force, and came over like an overwhelming force.