During the five years following the death of Ogotai, the Mongols were absorbed in the question who should be their next Great Khan, and it was only after a warm and protracted discussion, which threatened to entail the disruption of Mongol power, and the revelation of many rivalries among the descendants of Genghis, that Kuyuk, the eldest son of Ogotai, was proclaimed emperor. At the kuriltai held for this purpose, all the great Mongol leaders were present, including Batu, the conqueror of Hungary, and after the Mongol chiefs had agreed as to their chief, the captive kings, Yaroslaf of Russia and David of Georgia, paid homage to their conqueror. We owe to the monk Carpino, who was sent by the Pope to convert the Mongol, a graphic account of one of the most brilliant ceremonies to be met with in the whole course of Mongol history. The delay in selecting Kuyuk, whose principal act of sovereignty was to issue a seal having this inscription: "God in Heaven and Kuyuk on earth; by the power of God the ruler of all men," had given the Sungs one respite, and his early death procured them another. Kuyuk died in 1248, and his cousin, Mangu, the son of Tuli, was appointed his successor. By this time the Mongol chiefs of the family of Genghis in Western Asia were practically independent of the nominal Great Khan, and governed their states in complete sovereignty, and waged war without reference to Karakoram. This change left the Mongols in their original home of the Amour absolutely free to devote all their attention to the final overthrow of the Sungs, and Mangu declared that he would know no rest until he had finally subjected the last of the Chinese ruling families. In this resolution Mangu received the hearty support of his younger but more able brother, Kublai, to whom was intrusted the direction in the field of the armies sent to complete the conquest of China.
Kublai received this charge in 1251, so that the Sungs had enjoyed, first through the pacific disposition of Ogotai, and, secondly, from the family disputes following his death, peace for more than fifteen years. The advantage of this tranquillity was almost nullified by the death of Mongkong, a general whose reputation may have been easily gained, but who certainly enjoyed the confidence of his soldiers, and who was thought by his countrymen to be the best commander of his day. When the Chinese emperor, Litsong, saw the storm again approaching his northern frontier, he found that he had lost the main support of his power, and that his military resources were inferior to those of his enemy. He had allowed himself to be lulled into a false sense of security by the long inaction of the Mongols, and although he seems to have been an amiable prince, and a typical Chinese ruler, honoring the descendants of Confucius with the hereditary title of duke, which still remains in that family, and is the only title of its kind in China, and encouraging the literary classes of his country, he was a bad sovereign to be intrusted with the task of defending his realm and people against a bold and determined enemy.
Kublai prepared the way for his campaigns in Southern China by following a very wise and moderate policy in Northern China similar to that begun by Muhula, and carried out with greater effect by Yeliu Chutsai. He had enjoyed the advantage of a Chinese education, imparted by an able tutor named Yaochu, who became the prince's private secretary and mentor in all Chinese matters. At his instigation, or, at least, with his co-operation, Kublai took in hand the restoration of the southern portion of Honan, which had been devastated during the wars, and he succeeded in bringing back its population and prosperity to that great province of Central China. He thus secured a base for his operations close to the Sung frontier, while he attached to his person a large section of the Chinese nation. There never was any concealment that this patronage of Chinese officials, and these measures for the amelioration of many millions of Chinese subjects, were the well calculated preliminaries to the invasion of Southern China and the extinction of the Sung dynasty.
If Kublai had succeeded in obtaining a wise adviser in Yaochu, he was not less fortunate in procuring a great general in the person of Uriangkadai, the son of Subutai, and his remarkable and unvarying successes were largely due to the efforts of those two men in the cabinet and the field. The plan of campaign, drawn up with great care and forethought by the prince and his lieutenant, had the double merit of being both bold and original. Its main purpose was not one that the Sung generals would be likely to divine. It was determined to make a flank march round the Sung dominions, and to occupy what is now the province of Yunnan; and, by placing an army in the rear of their kingdom, to attack them eventually from two sides. At this time Yunnan formed an independent state, and its ruler, from his position behind the Sung territory, must have fancied himself secure against any attack by the Mongols. He was destined to a rude awakening. Kublai and Uriangkadai, marching across Szchuen and crossing the Kinchakiang, or "river of golden sand," which forms the upper course of the Great River, on rafts, burst into Yunnan, speedily vanquished the frontier garrisons, and laid siege to the capital, Talifoo. That town did not hold out long, and soon Kublai was in a position to return to his own state, leaving Uriangkadai with a considerable garrison in charge of Yunnan. That general, believing that his position would be improved by his resorting to an active offensive, carried the standard of his race against the many turbulent tribes in his neighborhood, and invaded Burma whose king, after one campaign, was glad to recognize the supremacy of the Mongols. The success and the boldness, which may have been considered temerity, of this campaign, raised up enemies to Kublai at the court of Karakoram, and the mind of his brother Mangu was poisoned against him by many who declared that Kublai aspired to complete independence. These designs so far succeeded, that in 1257 Mangu finally deprived Kublai of all his commands, and ordered him to proceed to Karakoram. At this harsh and unmerited treatment Kublai showed himself inclined to rebel and dispute his brother's authority. If he had done this, although the provocation was great, he would have confirmed the charges of his accusers, and a war would have broken out among the Mongols which would probably have rent their power in twain in Eastern Asia. But fortunately Yaochu was at hand to give prudent advice, and after much hesitation Kublai yielded to the impressive exhortations of his experienced and sagacious minister. He is reported to have addressed Kublai in the following terms: "Prince! You are the brother of the emperor, but you are not the less his subject. You cannot, without committing a crime, question his decisions, and, moreover, if you were to do so, it would only result in placing you in a more dangerous predicament, out of which you could hardly succeed in extricating yourself, as you are so far distant from the capital where your enemies seek to injure you. My advice is that you should send your family to Mangu, and by this step you will justify yourself and remove any suspicions there may be."
Kublai adopted this wise course, and proceeded in person to Karakoram, where he succeeded in proving his innocence and in discomfiting his enemies. It is said that Mangu was so affected at the mere sight of his brother that he at once forgave him without waiting for an explanation and reinstated him in all his offices. To ratify this reconciliation Mangu proclaimed that he would take the field in person, and that Kublai should hold joint command with himself. When he formed this resolution to proceed to China in person, he appointed his next brother, Arikbuka, to act as his lieutenant in Mongolia. It is necessary to recollect this arrangement, as Mangu died during the campaign, and it led to the separation of the Chinese empire and the Mongolian, which were divided after that event between Kublai and Arikbuka.
Mangu did not come to his resolution to prosecute the war with the Sungs any too soon, for Uriangkadai was beginning to find his isolated position not free from danger. Large as the army of that general was, and skillfully as he had endeavored to improve his position by strengthening the fortresses and recruiting from the warlike tribes of Yunnan, Uriangkadai found himself threatened by the collected armies of the Sungs, who occupied Szchuen with a large garrison and menaced the daring Mongol general with the whole of their power. There seems every reason to believe that if the Sungs had acted with only ordinary promptitude they might have destroyed this Mongol army long before any aid could have reached it from the north. Once Mangu had formed his resolution the rapidity of his movements left the Sungs little or no chance of attacking Uriangkadai. This campaign began in the winter of 1257, when the troops were able to cross the frozen waters of the Hoangho, and the immense Mongol army was divided into three bodies, while Uriangkadai was ordered to march north and effect a junction with his old chief Kublai in Szchuen. The principal fighting of the first year occurred in this part of China, and Mangu hastened there with another of his armies. The Sung garrison was large, and showed great courage and fortitude. The difficulty of the country and the strength of several of their fortresses seconded their efforts, and after two years' fighting the Mongols felt so doubtful of success that they held a council of war to decide whether they should retreat or continue to prosecute the struggle. It has been said that councils of war do not come to bold resolutions, but this must have been an exception, as it decided not to retreat, and to make one more determined effort to overcome the Chinese. The campaign of 1259 began with the siege of Hochau, a strong fortress, held by a valiant garrison and commander, and to whose aid a Chinese army under Luwenti was hastening. The governor, Wangkien, offered a stout resistance, and Luwenti succeeded in harassing the besiegers; but the fall of the fortress appeared assured, when a new and more formidable defender arrived in the form of dysentery. The Mongol camp was ravaged by this foe, Mangu himself died of the disease, and those of the Mongols who escaped beat a hasty and disorderly retreat back to the north. Once more the Sungs obtained a brief respite.
The death of Mangu threatened fresh disputes and strife among the Mongol royal family. Kublai was his brother's lawful heir, but Arikbuka, the youngest of the brothers was in possession of Karakoram, and supreme throughout Mongolia. He was hostile to Kublai, and disposed to assert all his rights and to make the most of his opportunities. No Great Khan could be proclaimed anywhere save at Karakoram, and Arikbuka would not allow his brother to gain that place, the cradle of their race and dynasty, unless he could do so by force of arms. Kublai attempted to solve the difficulty by holding a grand council near his favorite city of Cambaluc, the modern Pekin, and he sent forth his proclamation to the Mongols as their Khan. But they refused to recognize one who was not elected in the orthodox fashion at Karakoram; and Arikbuka not merely defied Kublai, but summoned his own kuriltai at Karakoram, where he was proclaimed Khakhan in the most formal manner and with all the accustomed ceremonies. Arikbuka was undoubtedly popular among the Mongols, while Kublai, who was regarded as half a Chinese on account of his education, had a far greater reputation south of the wall than north of it. Kublai could not tolerate the open defiance of his authority, and the contempt shown for what was his birthright, by Arikbuka; and in 1261 he advanced upon Karakoram at the head of a large army. A single battle sufficed to dispose of Arikbuka's pretensions, and that prince was glad to find a place of refuge among the Kirghiz. Kublai proved himself a generous enemy. He sent Arikbuka his full pardon, he reinstated him in his rank of prince, and he left him virtually supreme among the Mongol tribes. He retraced his steps to Pekin, fully resolved to become Chinese emperor in reality, but prepared to waive his rights as Mongol Khan. Mangu Khan was the last of the Mongol rulers whose authority was recognized in both the east and the west, and his successor, Kublai, seeing that its old significance had departed, was fain to establish his on a new basis in the fertile, ancient and wide-stretching dominions of China.
Before Kublai composed the difficulty with Arikbuka he had resumed his operations against the Sungs, and even before Mangu's death he had succeeded in establishing some posts south of the Yangtsekiang, in the impassability of which the Chinese fondly believed. During the year 1260 he laid siege to Wochow, the modern Wouchang, but he failed to make any impression on the fortress on this occasion, and he agreed to the truce which Litsong proposed. By the terms of this agreement Litsong acknowledged himself a Mongol vassal, just as his ancestors had subjected themselves to the Kins, paid a large tribute, and forbade his generals anywhere to attack the Mongols. The last stipulation was partly broken by an attack on the rear of Uriangkadai's corps, but no serious results followed, for Kublai was well satisfied with the manner in which the campaign terminated, as there is no doubt that his advance across the Yangtsekiang had been precipitate, and he may have thought himself lucky to escape with the appearance of success and the conclusion of a gratifying treaty. It was with the reputation gained by this nominal success, and by having made the Sungs his tributaries, that Kublai hastened northward to settle his rivalry with Arikbuka. Having accomplished that object with complete success, he decided to put an end to the Sung dynasty. The Chinese emperor, acting with strange fatuity, had given fresh cause of umbrage, and had provoked a war by many petty acts of discourtesy, culminating in the murder of the envoys of Kublai, sent to notify him of his proclamation as Great Khan of the Mongols. Probably the Sung ruler could not have averted war if he had shown the greatest forbearance and humility, but this cruel and inexcusable act precipitated the crisis and the extinction of his attenuated authority. If there was any delay in the movements of Kublai for the purpose of exacting reparation for this outrage, it was due to his first having to arrange a difficulty that had arisen in his relations with the King of Corea. That potentate had long preserved the peace with his Mongol neighbors, and perhaps he would have remained a friend without any interruption, had not the Mongols done something which was construed as an infraction of Corean liberty. The Corean love of independence took fire at the threatened diminution of their rights, they rose en masse in defense of their country, and even the king, Wangtien, who had been, well disposed to the Mongol rulers, declared that he could not continue the alliance, and placed himself at the head of his people. Seeing himself thus menaced with a costly war in a difficult country on the eve of a more necessary and hopeful contest, Kublai resorted to diplomacy. He addressed Wangtien in complimentary terms and disclaimed all intention of injuring the Coreans, with whom he wished to maintain friendly relations, but at the same time he pointed out the magnitude of his power and dilated on the extent of the Mongol conquests. Half by flattery and half by menace Kublai brought the Corean court to reason, and Wangtien again entered into bonds of alliance with Cambaluc and renewed his old oaths of friendship.
At this point of the long struggle with the Sungs it will be appropriate to consider what was the exact position of Kublai with regard to his own Chinese subjects, who now formed the backbone of his power. By this time Kublai had become to all practical intents and purposes a Chinese emperor. He had accepted all the traditional functions of the typical Hwangti, and the etiquette and splendor of his court rivaled that of the Sungs. He had not merely adopted the Chinese system of taxation and the form of administration to which the larger portion of his officials, being of Chinese race, had been accustomed, but he declared himself the patron of learning and of Buddhism, which had gained a hold on the minds of the Mongols that it has not lost to the present day. One of the most popular of his early measures had been the order to liberate all the literate class among his Chinese prisoners, and they had formed the nucleus of the civil service Kublai attached to his interests and utilized as his empire expanded. In his relations with Buddhism Kublai showed not less astuteness, and in realizing that to attain durable success he must appeal to the religious side of human character, he showed that he had the true instincts of a statesman.
At this time two facts were clearly apparent. The Chinese were sunk in a low state of religious disbelief, and the Sung rulers were not disposed to play the part of regenerators of their country. The second fact was that the only vigorous religion in China, or, indeed, in Eastern Asia, was Buddhism, which, since the establishment of Brahmanism in India, had taken up its headquarters in Tibet, where, however, the supreme authority was still secular—that is to say, it was invested in the hands of a prince or king, and not in those of a priest or Grand Lama. It so happened that there was resident at Kublai's court a Tibetan priest, of the family which had always supplied the Sanpou with his minister, who gained the ear of Kublai, and convinced him how politic and advantageous to him personally it would be if he were to secure the co-operation and sympathy of his priestly order. Kublai fell in with his plans, and proclaimed his friend Pakba Lama, and sent him back to Tibet, there to establish the ecclesiastical authority, which still exists in that country, in intimate alliance and sympathy with the Chinese rulers. By this and other similar proceedings Kublai gained over to his side several influential classes among the Chinese people, and many reflecting persons thought they saw in him a true regenerator of the empire, and a worthy successor of their greatest rulers. It was, therefore, with a thoroughly pacified country, and to a great extent a contented people, that Kublai began his last war with the rulers of Southern China.