Mahamat naively thought that Genghis Khan was cowardly, ignored it, and flatly rejected the envoy's request. Mahamat not only killed Bahar with his own hands, but also ordered his men to shave the beards of the two lieutenants as a sign of humiliation, and then escorted them out of the country.

For his own selfish interests, the conceited Mahamat did not take Genghis Khan seriously at all, because he could not hold Genghis Khan in his eyes. At this time, Mahamat had already decided to devote his country's strength to a showdown with the Mongols, tying the soldiers and civilians of Khorezm to the chariot and pushing them to the brink of war.

The two lieutenants were shaved off their beards and forcibly expelled from the country, which was a great disrespect to the Mongolian state. As soon as they returned to the Mongolian steppe, Genghis Khan comforted the envoy and sympathized with the family of the slain envoy. He will march west with his sword, lead his Mongol cavalry expedition, set foot on the city of Kharathara, sweep through the kingdom of Khorezm, capture Mahamat alive, kill all those guilty, and avenge the death of his people.

Genghis Khan entrusted the command of the attack on Jin to Mu Huali, but he himself devoted himself to formulating a battle plan for the conquest of Khorezm.

If we want to launch an all-out war against Khorezm, we must first deal with the small surrounding countries and the remnants of the enemy, open up the Silk Road through Central Asia and the Western Regions, and ensure that Mongolia's follow-up troops and logistical resources are continuously sent to the front line. Genghis Khan led his troops to defeat the Western Xia and Uyghur tribes one after another, and firmly controlled the eastern section of the Silk Road.

Genghis Khan then sent his eldest son Jochi and the general Jebe to lead the Mongol army with more than 20,000 horses and horses to attack the Western Liao State, which had protected the Uyghurs. Jebe announced the policy of "no robbery, no burning, no killing", and adopted the strategy of "political disintegration as the mainstay, supplemented by military strikes", the Mongolian army strictly disciplined, widely publicized freedom of religion, opened the mosques that were seized, and won the support of a large number of believers.

The soldiers of the capital of the Western Liao Kingdom, Balasagon and the cities of Lingbei, surrendered without a fight, and the self-proclaimed emperor Qu Lu of the Western Liao, who had retreated to the point of being out of harmony, fled in a hurry with three retinues. Qu Lu was captured by hunters in the valley of the Badaha Wound Realm and sent to Jebe.

In order to extinguish the anger of the Western Liao, Jebe beheaded Qu Lu Cong for public display. Jochi and Subutai led their armies to annihilate the enemy's Mierbeg tribe in the Chui River Valley, and in this way, the trade wealth in the middle section of the Silk Road was also pocketed by Mongolia.

The battle to conquer the Western Liao opened the prelude to the outpost of the Western Expedition, and the Kingdom of Khorezm still controlled the western section of the Silk Road, and it was so arrogant to squeeze most of the profits. After taking the Western Liao, the western territory of the Mongol Empire bordered the Western Regions, and Genghis Khan patrolled the border many times. Samarkand, once the capital of Western Liao, was seized by foreigners, and Genghis Khan really wanted to immediately lead his thousands of troops to recover the land of the Chinese and strangle the confused king Mahamat who approved the massacre of the Mongol caravans.

The Mongol Empire led the core group through a collective resolution, and finally finalized the war policy for the western conquest of the Khorezm Kingdom. Genghis Khan recruited a large number of men and horses from Western Xia, Wuur, Hararu and Western Liao to participate in the campaign, mainly responsible for miscellaneous labor and covering logistics and communication lines. Thousands of craftsmen were recruited from the territory of Mongolia to accompany the army and an engineer battalion was formed to strengthen the Mongol cavalry's ability to attack fortifications. The main forces of the Mongol army all participated in the western expedition, mobilizing no less than 200,000 troops, and the general offensive was planned to begin in the autumn of 1219.

In order to prevent the old nobles of the Mongol tribes from waiting for an opportunity to counterattack after the westward expedition, Genghis Khan appointed Mu Huali as the Taishi King to undertake the provincial system, and commanded part of the Mongolian army and all the troops in the Central Plains to surrender troops steadily, and continue to attack the Jin Dynasty. Prince Timug and Arakhe Beji were appointed as the southern and northern superintendents of the desert respectively, and led part of the Mongolian army to stay in the grassland.

The Mongol cavalry under the command of Genghis Khan, after years of conquest, has developed into a well-equipped, well-trained, tactically skilled, brave attack, and disciplined army.

The Mongolian war horse they ride on is a special kind of war horse, which lives in the wild in spring, summer, autumn and winter, and is extremely enduring. Every Mongol soldier was skilled in mounted archery, and they could shoot their enemies with their bows and arrows as their horses sprinted quickly, and even if they retreated, they could frequently look back and shoot their pursuers off their horses.

In order to eliminate the challenger Mahamat in one fell swoop, the Mongol kings, horses, and generals raced against time and actively prepared for the war, completing all preparations before the expedition from the end of 1218 to the beginning of 1219. Everything is ready, only the east wind is owed, just waiting for Genghis Khan's order.

Before his expedition, Genghis Khan equipped each Mongol cavalryman with basic weaponry, including leather armor, a small amount of chain armor captured from the enemy, spears, scimitars, maces, javelins, lassoes, and bows and arrows. These equipment are carried with you or placed in the saddle. Don't underestimate them, although they are very simple, they are very practical, especially suitable for cavalry charging and fighting in actual combat.

The day before the western expedition, Genghis Khan said goodbye to the queens one by one, and only ordered Madame Hulan to follow. Then the queen said with tears in her eyes: "Among the princes, there are four descendants, who should inherit the lord after the lord lives for thousands of years?" When your pillar-like body falls, who will take care of the people like a flock of birds? Who governs the chaotic people? Let your sons and brothers, and your many subjects, and our weak and foolish women also know this. ”

Genghis Khan is 57 years old this year, and he is not sure how long it will take to attack the kingdom of Khorezm, and whether he can come back.

He thought for a moment and sighed, "Even if she is a woman, she is right. No one, brothers, children and grandchildren, or children and grandchildren, or their sons and daughters, Mu Huali, have never made such a suggestion. In this westward expedition, I want to cross mountains and rivers to pacify many countries, there are no immortal people in the world, and it is time to determine the heir. ”

Genghis Khan immediately summoned his sons and brothers to discuss the matter of the heir to the Mongol throne. Although Jochi was the eldest son, Genghis Khan always suspected that there was something wrong with this son's bloodline, so he abandoned the primogeniture. The second son, Chagatai, advocated force, was more ferocious, and had a long-term feud with Jochi, and was not a suitable candidate for the Great Khan. Torre had a talent for governing the country, but as a young son, the princes and nobles who elected him as his heir were not satisfied.

Only when we are broad-minded and resourceful can we govern the country in a more comprehensive way. At the age of 18, Genghis Khan conquered the Kereh tribe, the Naiman tribe, the Mierqi tribe, the Maigudan, Totari, Chahun and other tribes. Ogedai is also very low-key, has a strong affinity, and has a high reputation in the army and the DPRK. The Golden Family Council unanimously voted to establish Ögedei as the heir, and then Ögedai and his father embarked on a crusade against the kingdom of Khorezm.

In the spring of 1219, Genghis Khan held a general mobilization speech in the steppe of the Troubled River: "Ladies and gentlemen, Khorezm Shamahamad killed my envoys, robbed my caravan, invaded our borders, and deliberately undermined peace. This is a blatant provocation to our Great Mongol Empire, and the enemy has put a knife on our neck, and Mahamat is our enemy. Warriors, endless wealth and countless women are your targets! Warriors, raise your scimitars and maces, and slay the damned Khorezmians to make them pay for their crimes and ignorance! ”

As soon as Genghis Khan's words fell, tens of thousands of Mongolian iron horsemen raised the weapons in their hands and shouted: "Long live the Great Khan, long live the Great Khan!" Flat Khorezm, step flat Khorezm! The shouts resounded in the sky, the grassland of the Trouble River was crowded, the war horses neighed, and the black iron horses could not be seen from the beginning to the end.

"Let's go!" Genghis Khan gave the order, and the high-spirited Mongol cavalry galloped westward like a tide.

The Mongol army was divided into four routes: the first route was directed by Ögedai and Chagatai to attack the Sadara, the second route was directed by Jochi to go down the Kuzhang River to fetch felt, and the third route was led by Ara Hei Nayan to the south to take Benakte and Khuyu, and the main force of Genghis Khan and Tuleitong crossed the desert and went straight to Buhuara. Son-in-law Yang Guangye, as the commander-in-chief of artillery and engineers, dispatched special forces at any time to support all walks of life in attacking the city.

The Mongol cavalry traveled all the way and reached the capital of Western Liao, Hu Si and Ear, at the turn of summer and autumn. Mamudu Khan of Hararu, Jin Khan of Al Mali, and Yidu Huwang of the Wuer tribe led their respective soldiers and horses to the territory of Western Liao and came to join Genghis Khan's army.

Genghis Khan ordered Jebe and Subutai to drive the advance detachment of the Mongol army to the western border of Western Liao, and sent various reconnaissance detachments to go deep into the eastern border area of Khorezm to reconnoiter the deployment of the Khorezm army. He asked the two vanguard officers to focus on strengthening the reconnaissance of the city of Retara, which was the first target of the Mongol army.

At this time, the total strength of the Khorezm army was 400,000 regular field troops, which was twice the size of the Mongol cavalry, and it was in an advantageous position. The time and place were not as favorable as the people, and there were many contradictions within the ruling clique of Khorezm, which hindered a high degree of unity and coordinated operations among the armed forces. Han Kedun, the bald son of the queen mother, who was born in the Kangli tribe, controlled the government, trusted his relatives, and let his younger brother and nephew serve as high-ranking officers and control the army.

Fearing that the military aristocracy, supported by his mother, would wait for an opportunity to seize the throne, Mahamat decided to divide his forces to defend the castles in the Transoxiana region and rely on the strong fortifications for defensive operations. He ordered the city guards to stock up on grain and grass, fortify the fortifications, and prepare for battle.

Mahamat collected all three years' grain in advance, and he wanted to fight a protracted war with Temujin, dragging the 200,000 Mongol soldiers fat and thin and thin to death. He firmly believed that the vast Gobi and deserts in Central Asia were the graveyards of the Mongol expeditionary forces, and they had no return.

Yang Guangye, the commander-in-chief of the special forces, did not receive the order of Genghis Khan's general attack for a long time, he was so anxious that he scolded in his heart from time to time: "Mahama, you arrogant guy, you give you a shameless face, toast and don't eat and drink, you are dying!" ”