Duoduo looked at the Qing cavalry in front of him, the people turned on their horses, the war horses screamed sadly, and the wounded soldiers howled loudly, and they did not recover for a long time.It wasn't until Li Guo withdrew his troops and disappeared without a trace that he remembered to ask his subordinates to send someone to check forward.Seeing the round holes dug by the Northwest Army in the ground, one by one, Duoduo's nose was almost crooked.These are all gods and horses, is there such a war, isn't this a pit people, it is a pit man, not only a pit man, but also a pit horse.On the way north from Xi'an, Song Xiance was thinking about ways to deal with the cavalry along the way.Only by restricting the cavalry of the Qing army can Li Guo hold Luochuan, and the whole battle situation can have the hope of turning defeat into victory.Fortunately, from Yan'an to Luochuan are all plateaus, and most of the time the war horses can only walk in the ravines, which creates conditions for him to design the cavalry of the pit Duoduo.Song Xiance arrived in Luochuan, and at this time, Duoduo strikers had just arrived in Yan'an.He didn't care about resting, and asked Li Guo to take him all the way north, and looked at all the paths that Duoduo was going to take on the march.All the necessary paths for war horses, he designed a clever plan to pit the other party according to the terrain.Li Guo was already able to fight guerrilla warfare and sports warfare, and coupled with Song Xiance's bad moves, Duoduo was miserable.Duoduo put his cavalry in order, advanced again, and played two rounds, and in front of him was a narrow ravine, more than ten miles long.Duoduo was afraid of being tricked again, so he sent a sentinel to check the front and back of the cavalry, but he did not find that there was an ambush of the Northwest Army nearby, and there was no strange situation on the ground, so he dared to order the team to advance into the ravine.This time, Song Xiance used landmines.Landmines were available during the war in the Song Dynasty, but they were not as advanced as Wang Shuo's.Wang Shuo's mine is already a tripping thunder, and no one needs to light the fuse.All you need is a wooden plank, made into a rotating pedal, and a tripping rope that hooks the mine, no matter whether it is a person or a war horse, as long as you step on the plank, the mine will sound.Moreover, this mine is not a stone mine in the Song Dynasty, a clay pot mine, but a real cast steel mine, with fragments and grooves, and its lethality is extremely high.Song Xiance was even more self-taught, he buried the mine in the middle of the ravine, lengthened the pull rope as much as possible, and pulled the distance between the mine and the pedal until the pull rope could not detonate the mine because of elasticity.This is the same as the "scorpion thunder" in the tunnel war.After experiments, the material of the rope was constantly changed, and the distance between the pedal and the mine was extended to more than ten zhang away.In other words, Duoduo's cavalry had to go to the middle of the ravine, and then go more than ten kilometers further before they could trigger the mines behind.After the pedal was knocked over, the one who triggered the mine did not die, and the one behind it was blown up.The horses in front of them were frightened, and they must run forward and run near the exit of the ravine, and then the chain of minefields was triggered.This serial mine was developed by Wu Langxi's laboratory, and the triggering principle is different.When a mine explodes, the hook spring connected to another mine is blown away, and through the pulley principle, the rope of the other mine will be pulled apart by the weight, and then it will explode.And so on, interlocking.Song Xiance expected that Duoduo would send sentinels to investigate, leaving a few soldiers to ambush in the nearby barren grass and soil pits, and after the enemy reconnaissance troops left, they immediately pulled away the long wooden planks covering the mine pedals on the road.Therefore, even if the reconnaissance cavalry walked through the ravine and stepped on the pedal, which was covered with a long wooden plank, the mine would not be triggered.More than ten miles of ravines, it is too easy to hide a few soldiers, where can be easily found This gang of scouts fortunately did not find anything, if they are found, it is estimated that their lives will be left here.For the sake of safety, Li Guo left a thousand men and horses outside the valley mouth and on the mountains on both sides, as long as there was an abnormality in the ravine, these horses would immediately lean over and wipe out the enemy scouts in the ravine.Anyway, you are going to Luochuan, you can't get through this road, sooner or later you still have to enter this ravine, Lao Tzu is not afraid of being discovered by you.The Manchurian cavalry would never have dreamed that there would be such strange things hidden under this ravine, and they had never seen them.They just observed whether there were any ambushes from the Northwest Army around them, and then they learned to see if there were any pits and horses dug in the ground.When they did not have any of this, they thought it safe and sent for them to inform the advance of the front army of Dordor and to reconnoiter beyond the ravine.More than 10,000 people in Duoduo's front army entered the minefield in such a daze.On the mountain in the distance, Li Guo and Song Xiance saw through binoculars, and then they gave the order for the army to quietly move around the ravine.Wang Shuo had a whim, and let Wu Langxi make this telescope to solve a big problem.Wu Langci had attended Galileo's class at the Italian seminary, and he already knew the principle of lens, and could grind lenses and make monoculars.As soon as Wang Shuo explained the principle of binoculars, Wu Langxi immediately understood.Moreover, Wang Shuo also told him the method of using metal to make glass molds, and the quality of the lens obtained was greatly improved, and he could see more clearly in the distance.In this way, on the battlefield, Duoduo couldn't understand what the Northwest Army was doing and what he was doing, but Li Guo and Song Xiance could see it, and it seemed to be under their noses, clearly.Li Guo only left 30,000 horses on his side to act as a frontal blocker, and the rest were sent out to fight guerrilla warfare and movement warfare.They were widely distributed in companies or regiments on the vast plateau from Yan'an to Luochuan, and each unit had local soldiers who were familiar with the terrain as guides, and they were surrounded by a large army of Duoduo regardless of east, west, north and south.Even these scattered combat power are enough for Duoduo to drink a pot.His army could only be concentrated and advanced, not daring to be too scattered.Even so, the men and horses on the periphery were still constantly being attacked by sneak attacks, and the war horses suffered countless losses, and they were about to make up a cavalry army for Li Guo.In desperation, Duoduo could only divide his troops into three armies, the front, the middle, and the rear army, the front army was responsible for clearing the enemy troops along the way, and then the largest number of Chinese troops advanced, and the rear army protected the baggage grain and grass to prevent the northwest army from sneaking into his rear.The three armies were separated by more than ten miles, so as not to be surrounded by the enemy and unable to exert their forces.In this way, the front army dragged on for nearly a hundred miles from the rear army, and the enemy could not surround them, and when they encountered the enemy, they could also open up each other.Fortunately, Duoduo was in charge of the Chinese army and did not follow the front army, otherwise, he would have to be reimbursed.Li Guo left 30,000 horses, of course, just in case, to fight a positional battle at the last moment to prevent the Qing army from entering the Weinan Plain.The 30,000 people he left behind had all returned from Hubei with him, and had also participated in the defense of Yulin and Yan'an.He asked Wang Shuo to send a message to the political commissar he sent to each soldier left behind through the political work system, telling them that they had lived and fought in this land, and how many former comrades-in-arms and brothers had died in this land and under the sword of the Qing army.If you want to avenge your relatives, comrades-in-arms, and brothers, you will stay with him, regardless of your own life, and fight to the end with the Qing army.He didn't want to take revenge and cherish his life, he wouldn't blame them, and would arrange them to be in a relatively safe army, leaving some seeds for King Chuang's old troops.As a result, the blood of the 30,000 soldiers was boiling, and none of them wanted to leave him, they all had to follow him, and they would rather die with the Qing army than take a step down the plateau: