On September 21, the 14th year of Zhenguan, Xue Wanche, the commander of the Tang Expeditionary Force, and the Emperor of the Eastern Roman Empire and the Emperor of the Persian Empire held a tripartite alliance, and formally determined that the three countries would gather 500,000 troops to the south to completely destroy the exhausted Arab Empire.

The more than 400,000 strong troops trained by the Arab Empire in the east and west against the Persian Empire and the Eastern Roman Empire have been wiped out in the three-year war, and the remaining less than 30,000 are left, only three of the more than ten famous generals are still alive, and the remaining eight are all killed.

In fact, the Arabs also understand in their hearts, the Romans and Persians also understand in their hearts, they have today, the Arabs have today, and 80% of the credit must be given to the Tang people, if it were not for the Tang Dynasty army rushing to aid the Persians, it is estimated that the Persians have been beaten to the death of the present, and even the capital will be lost, in that case, the battle will become meaningless, and the Persians will lose their containment, and the Romans feel that they are not the opponent of the Arabs who annexed the Persians.

It would be very thrilling, even if the Arabs did not have the strength to completely destroy the Eastern Roman Empire, but it was still possible to inflict heavy losses, such as Syria, such as the rich grain-producing land, which was the lifeblood of the empire.

Therefore, the Persians and the Romans had a consensus, so when they were dissatisfied with the battle plan formulated by the commander of the Tang army, they still decided to abide by the battle plan, because the Tang army's achievements demonstrated their strong combat effectiveness and absolute will to fight above the three major empires in Central Asia, even including their fighting methods and war technology. The terrible artillery, at first the shells did not explode, but now the shells will explode, and every time the artillery comes on, the Arabs will always be blown to pieces, and their own combat attrition is very small.

They even know. The Tang army has the strength to destroy the remaining forces of the Arab Empire alone, even if they only have 100,000 troops, and now the Arab Empire still claims to have 500,000 troops, but there is no problem with complete defeat, the only problem is the rule, this point, the Eastern Roman Empire and the Persian Empire are actually secretly competing, everyone wants to get more land of the Arab Empire, after the fall of the Arab Empire. After the common enemy is eliminated.

The Tang army made it clear that they don't want territory, their territory is already huge enough, and they now need time to sort out their territory and restore production and life, so all the territory of the Arab Empire belongs to these two empires, and you two families divide it yourself, we only need money, property and materials. And in the future, the Tang caravan and the Tang people have the right to move freely in the territory of your two empires, of course. There is also the establishment of embassies, which have the power to adjudicate themselves.

The two empires agreed to the request of the Tang Dynasty almost without any accidents, as long as you don't want the territory and the population, you can take the rest if you want, anyway, as long as there is land and population, we can regain it. It would be better if you don't want that, you are already strong, and if we want any more territory, we will have to consider whether it is necessary to unite against you.

This is also what the diplomats of the Tang Dynasty decided after careful consideration, if we want land and population. They will form an alliance against us, we don't want land and population, but if we need a stable border and enough time, then they will eat dog and consume each other and have lost a lot of strength, then it will be very good for our future plans.

The reason why we deal with the Arab Empire is just that they will have a great impact on us after they replace the Persian Empire, we have no idea about the population and territory here, you don't look the same as us, the language is different, and it is too difficult to rule, so don't do it at all, just give us money and various benefits, and the Tang people will enjoy the highest standard of treatment here, which is our highest requirement.

The two empires signed the "Treaty of Friendship and Mutual Assistance between the Tang Dynasty and Rome" and the "Treaty of Friendship and Mutual Assistance between the Tang Dynasty and Persia" respectively, which determined the mutual friendly relations between the three countries in a legal sense, of course, it did not include the contract between the Romans and the Persians, they did not seem to intend to sign the relevant agreement, and they had already begun relevant negotiations and frictions between them, when the war had not yet begun.

On September 27, the 14th year of Zhenguan, the Romans and the Persians had a small military friction in northern Mesopotamia, because both sides were interested in a fertile land, and the armies of both sides did not intend to give up this land, so the Romans 120 and the Persians 80 engaged in a skirmish, and the result was a victory for the Romans, killing and wounding more than 30 Persians, while the Persians killed more than 20 Romans and wounded more than 50 Romans.

The governments of the two sides immediately began to criticize each other, and gathered troops to confront each other, seeing that the fight was about to start, Xue Wanche was furious, and sent the general Xue Rengui to lead an army of 10,000 to the friction ground, and reprimanded both sides, and then sent envoys to the commander of the Romans and the commander of the Persians to mediate, on October 1, the 14th year of Zhenguan, under the mediation of the Tang army, the two countries stopped gathering troops, but drew a demarcation line in the local area, as the national border between the two sides after the war.

This was just a small-scale fight, but both the Romans and the Persians began to understand that the honeymoon cooperation period between the two sides had ended, rifts began to arise, and now there was mediation by the Tang army, but once the Tang army withdrew, or the Tang Dynasty did not intervene in the affairs between the two sides, then what kind of friction would arise between the two sides, and what kind of mustard would be produced, it was uncertain.

However, now under Xue Wanche's tiger power, both sides have honestly decided to shake hands and make peace, first clean up the Arabs, and then slowly clean up each other, so they have all got the battle strategy proposed by Datang, and said that they must strictly abide by it.

At this time, the Tang army was the least, only 100,000, and the Persian army was the largest, with 250,000. The Roman army also had 150,000, but considering that the combat effectiveness of the Persian army was really unsightly, the only powerful elite 30,000 light cavalry trained by the Tang generals had to be dispatched, and then Xue Wanche ordered Xue Rengui to lead an army of 10,000 to join the camp of the Persian army and serve as the deputy commander, and the main general was of course the Persians.

However, this Persian prefers to cooperate with the Tang people. He was happy to see the Tang Dynasty command the army to win a big victory and then he got the credit, so he was happy to hand over the actual command to Xue Rengui, and he didn't care, just take the credit, and the Romans still had a certain combat effectiveness, fought with the Arabs several times, and also independently defeated the Arabs' Western Expeditionary Legion and recaptured Syria, so Xue Wanche did not send anyone to help and command the Romans. He believed that the Romans could get the job done.

The task is to march in three directions, divide the troops into three routes, and go south from the left, center and right directions to the last territory of the Arab Empire, southern Mesopotamia, and then force the Arab Empire to first divide the troops into three ways to resist the three-way alliance army, disperse their strength, if it is a large army to fight together, they will have 500,000 men. We had 500,000 men out of the way, and this battle suddenly became the battlefield of a battle of 1 million people. How big of a battlefield can it take to accept a million people?

Therefore, decisively, the three-way march, Xue Wanche chose the most difficult middle road as the march route of the Tang army, the road was very bumpy, and there were many checkpoints, this only the Tang army with artillery could pass through the guò. As for the second right, it was handed over to the Roman legions, and the easiest left was handed over to the Persian legions under the command of Xue Rengui.

I've been beaten so many times. Hundreds of battles, large and small, the Persians won only five victorious battles independently, but lost more than 20 times, several times were turned over by the Arabs who were in a weak position, the number was still superior, it was simply a shame, even the Romans could not grab the territory, if the eighty Tang soldiers and the Romans grabbed the territory, the Romans could not run, all had to be explained there.

But having said that, but how much combat effectiveness the Arab believers who were hastily pulled to fill the army are in the end, everyone knows in their hearts that they are already at the end of the strong crossbow, if they continue to fight, they will completely collapse, these days I have got inside information that there is a pessimistic atmosphere within the Arabs, and even many people think that Allah and the Prophet abandoned them, so they left the land in despair, and even committed suicide, the strength of the main battle faction is getting smaller and smaller, after a large number of generals are killed, Their will to fight has dropped to an all-time low.

The war plan was well kept secret, only the commanders of the three sides knew, and then the battle order was issued to the other generals, and the 500,000-strong army set out, mightily southward to the south of Mesopotamia, the last territory of the Arab Empire, including their capital, and their holy land, the three armies marched with a devastating force, quickly swept away the scattered guerrilla resistance, and then found the defensive position of the main Arab army that had found the news.

The battle on the three sides was carried out almost at the same time, the vanguard echelon of the Arabs 100,000 troops were divided into three ways, to block the enemy in advance, respectively, to occupy the dangerous shape, relying on the city or the mountain peak to resist the attack of the Three Kingdoms Alliance, but unfortunately, there was no miracle, the Romans relied on the neat military formation and siege weapons to quickly conquer the city, the Tang army used artillery to solve the natural danger of the mountain, with hundreds of casualties to defeat the resistance of the 40,000 Arab army.

As for the Persians, they had a solid family background and many soldiers and horses, so they used more than 10,000 charging casualties to defeat the Arab resistance phalanx, Xue Rengui's wisdom was still good, but the Persians' combat effectiveness was really limited, and the number of new infantry troops was relatively large, while the traditional heavy cavalry was still proud and disdained to become infantry.

The defense line of the 100,000 army was breached in less than ten days, which was a huge deterrent to the Arabs, once upon a time, 100,000 troops could defeat the 300,000 Persians to the ground, and 200,000 troops could defeat the once powerful Roman legions face to face, but since the arrival of the armies of the powerful countries from the east, the good fortune of the Arabs seemed to have come to an end, they first lost famous generals, then hundreds of thousands of troops, the caliph died of grief and illness, and the fortunes of the country collapsed.

After the defeat of the 100,000 army, the situation in the country was even worse, there was a shortage of water, food, men, weapons, few people were willing to enter the army to fight for Allah and the Prophet, and the recruits did not even get iron weapons, only sticks and guns, and such weapons could not defeat the well-equipped enemy army.

The high-level Arab people are also in a hurry, the news on the front line is getting worse and worse, the enemy army is getting closer and closer to the capital, and after repeated defeats, some people have even lost the faith to continue fighting...... (To be continued......)