The Uyghurs, Qarluqs and local Turkic and Tajik peoples submitted to the Mongolians. The Uyghur state of Kara-Khoja was a vassal of the Kara-Khitans, but in 1210, the Uyghur ruler of Kara-Khoja, Idiqut Barchuq appeared before the Khan to declare his allegiance to the Mongolians.[1] He was rewarded with the daughter of Genghis in marriage, and the Uyghurs served under the Mongols as bureaucrats. A leader of the Qarluq and Buzar, the warlord of Chuy Valley, followed the Uyghur example.
The Kara-Khitans (Black Khitan) were Khitans of the Liao Dynasty (907–1125) who were driven out from China by the Jurchens of the Jin Dynasty. In 1124 some Khitans moved westward under Yeh-lü Ta-shih’s leadership and created the Kara-Khitan Khanate (Western Liao) between in the Semirechye and the Chu River. They dominated Central Asia in the 12th century afer they defeated the Great Seljuk leader Ahmed Sanjar at the Battle of Qatwan in 1141. However, their power was shattered in 1211 through the combined actions of the Khwārezm-Shah ʿAlāʾ ad-Dīn Muḥammad (1200–20), and Küchlüg, a fugitive Naiman prince in flight from Chinggis Khaan’s Mongolians. Kuchlug was given shelter by the Kara-Khiitans, but he usurped the Gurkhan‘s throne in 1211.[2]
Kuchlug attacked the city of Almaliq, and the Qarlugs there who were vassal of the Mongolians appealed to Chinggis Khaan for help.[3] In 1216, Genghis dispatched his general Jebe to pursue Kuchlug. The Mongols defeated the Kara-Khitans at Balasaghun, Kuchlug fled, but was later killed in 1218
After compiling information from many intelligence sources, primarily from spies along the Silk Road, Genghis Khan carefully prepared his army, which was organized differently from Genghis’ earlier campaigns.[9] The changes had come in adding supporting units to his dreaded cavalry, both heavy and light. While still relying on the traditional advantages of his mobile nomadic cavalry, Genghis incorporated many aspects of warfare from China, particularly in siege warfare. His baggage train included such siege equipment as battering rams, gunpowder, trebuchets, and enormous siege bows capable of throwing 20-foot arrows into siege works. Also, the Mongol intelligence network was formidable. The Mongols never invaded an opponent whose military and economic will and ability to resist had not been thoroughly and completely scouted. For instance, Subutai and Batu Khan spent a year scouting central Europe, before destroying the armies of Hungary and Poland in two separate battles, two days apart.[10]
The size of Genghis’ army is often in dispute, ranging from a small army of 90,000 soldiers to a larger estimate of 250,000 soldiers, and Genghis brought along his most able generals to aid him. Genghis also brought a large body of foreigners with him, primarily of Chinese origin. These foreigners were siege experts, bridge-building experts, doctors and a variety of specialty soldiers.
During the invasion of Transoxania in 1219, along with the main Mongol force, Genghis Khan used a Chinese specialist catapult unit in battle; they were used again in 1220 in Transoxania. The Chinese may have used the catapults to hurl gunpowder bombs, since they already had them by this time [11] While Genghis Khan was conquering Transoxania and Persia, several Chinese who were familiar with gunpowder were serving with Genghis’s army.[12] Historians have suggested that the Mongol invasion had brought Chinese gunpowder weapons to Central Asia. One of these was the huochong, a Chinese mortar.[13]
As the Mongols battered their way into Urgench, Genghis dispatched his youngest son Tolui, at the head of an army, into the western Khwarezmid province of Khorasan. Khorasan had already felt the strength of Mongol arms. Earlier in the war, the generals Jebe and Subutai had travelled through the province while hunting down the fleeing Shah. However, the region was far from subjugated, many major cities remained free of Mongol rule, and the region was rife with rebellion against the few Mongol forces present in the region, following rumors that the Shah’s son Jalal al-Din was gathering an army to fight the Mongols. Tolui’s army consisted of somewhere around 50,000 men, which was composed of a core of Mongol soldiers (some estimates place it at 7,000[18]), supplemented by a large body of foreign soldiers, such as Turks and previously conquered peoples in China and Mongolia. The army also included “3,000 machines flinging heavy incendiary arrows, 300 catapults, 700 mongonels to discharge pots filled with naphtha, 4,000 storming-ladders, and 2,500 sacks of earth for filling up moats.”[7] Among the first cities to fall was Termez then Balkh. The major city to fall to Tolui’s army was the city of Merv. Juvayni wrote of Merv: “In extent of territory it excelled among the lands of Khorasan, and the bird of peace and security flew over its confines. The number of its chief men rivaled the drops of April rain, and its earth contended with the heavens.”[18]
The garrison at Merv was only about 12,000 men, and the city was inundated with refugees from eastern Khwarezmia. For six days, Tolui besieged the city, and on the seventh day, he assaulted the city. However, the garrison beat back the assault and launched their own counter-attack against the Mongols. The garrison force was similarly forced back into the city. The next day, the city’s governor surrendered the city on Tolui’s promise that the lives of the citizens would be spared. As soon as the city was handed over, however, Tolui slaughtered almost every person who surrendered, in a massacre possibly on a greater scale than that at Urgench. After finishing off Merv, Tolui headed westwards, attacking the cities of Nishapur and Herat.[19] Nishapur fell after only three days; here, Tokuchar, a son-in-law of Genghis was killed in battle, and Tolui put to the sword every living thing in city, including the cats and dogs, with Tokuchar’s widow presiding over the slaughter.[18] After Nishapur’s fall, Herat surrendered without a fight and was spared. Bamian in the Hindukush was another scene of carnage during the 1221 siege of Bamiyan, here stiff resistance resulted in the death of a grandson of Ghengis. Next were the cities of Toos and Mashad. By spring 1221, the province of Khurasan was under complete Mongol rule. Leaving garrison forces behind him, Tolui headed back east to rejoin his father.
After the Mongol campaign in Khurasan, the Shah’s army was broken. Jalal al-Din, who took power after his father’s death, began assembling the remnants of the Khwarezmid army in the south, in the area of Afghanistan. Genghis had dispatched forces to hunt down the gathering army under Jalal al-Din, and the two sides met in the spring of 1221 at the town of Parwan. The engagement was a humiliating defeat for the Mongol forces. Enraged, Genghis headed south himself, and defeated Jalal al-Din on the Indus River. Jalal al-Din, defeated, fled to India. Genghis spent some time on the southern shore of the Indus searching for the new Shah, but failed to find him. The Khan returned northwards, content to leave the Shah in India.
After the remaining centers of resistance were destroyed, Genghis returned to Mongolia, leaving Mongolian garrison troops behind. The destruction and absorption of the Khwarezmid Empire would prove to be a sign of things to come for the Islamic world, as well as Eastern Europe.[14] The new territory proved to be an important stepping stone for Mongol armies under the reign of Genghis’ son Ögedei to invade Kievan Rus’ and Poland, and future campaigns brought Mongol arms to Austria, the Baltic Sea and Germany. For the Islamic world, the destruction of Khwarezmid left Iraq, Turkey and Syria wide open. All three were eventually subjugated by future Khans.
The war with Khwarezmia also brought up the important question of succession. Genghis was not young when the war began, and he had four sons, all of whom were fierce warriors and each with their own loyal followers. Such sibling rivalry almost came to a head during the siege of Urgench, and Genghis was forced to rely on his third son, Ögedei, to finish the battle. Following the destruction of Urgench, Genghis officially selected Ögedei to be successor, as well as establishing that future Khans would come from direct descendants of previous rulers. Despite this establishment, the four sons would eventually come to blows, and those blows showed the instability of the Khanate that Genghis had created.
Jochi never forgave his father, and essentially withdrew from further Mongol wars, into the north, where he refused to come to his father when he was ordered to.[3] Indeed, at the time of his death, the Khan was contemplating a march on his rebellious son. The bitterness that came from this transmitted to his sons, and especially grandsons, Batu and Berke Khan, (of the Golden Horde) who would conquer Kievan Rus.[10] When the Mamluks of Egypt managed to inflict one of history’s more significant defeats on the Mongols at the Battle of Ain Jalut in 1260, Hulegu Khan, one of Genghis Khan’s grandsons by his son Tolui, who had sacked Baghdad in 1258, was unable to avenge that defeat when Berke Khan, his cousin, (who had converted to Islam) attacked him in the Transcaucasus to aid the cause of Islam, and Mongol battled Mongol for the first time. The seeds of that battle began in the war with Khwarezmia when their fathers struggled for supremacy.[14]
History of Afghanistan 