Galdan was the younger son of the most powerful chief of his tribe. Full of ambition, and chafing at the subordinate position due to his birth, he quarrelled with some of his brothers and killed one of them. Being forced to flee, he made his way to Thibet, where he sought to obtain admission to the ranks of the Buddhist clergy, but was refused by the Dalai Lama on account of his deed of blood. But on his return to the tents of his tribe he found himself in a new position. His crime was forgotten or condoned, and the fact that he had dwelt in the palace and under the holy influence of the Dalai Lama, the supreme religious power in Buddhist Asia, gave him a high standing among his fellow-tribesmen. The influence thus gained and his boldness and ruthlessness completed the work he had in mind. The ruling khan was deposed, all members of his family whose hostility was feared by Galdan were slain, and he found himself at the head of the tribe, whose members were terrified into submission. His thirst for power now showed itself in encroachments upon the lands of neighboring clans. The Manchus were at that time embarrassed by the rebellion of Wou Sankwei, and the opportunity seemed excellent for an invasion of the district of the Khalkas, firm friends of the Manchu power. He also sent troops towards the Chinese frontier, fear of whom forced many of the tribesmen to cross the border and seek the emperor's aid. Kanghi could then only give them lands within his realm, being too much occupied at home to be able to do more than send spies into the steppes. From these he learned that Galdan had built up a formidable power and that he evidently had in view the subjection of all the tribes. Kanghi, anxious to settle these difficulties amicably, spent a number of years in negotiations, but his rival showed as much ability in diplomacy as in the field, and succeeded in masking his designs while he was strengthening his position and preparing for open hostilities. Finally, with an army of thirty thousand men, he invaded the country of the Khalkas, and in 1690 took his first open step of hostility against China, by arresting the envoys who had been sent to his camp. This insult put an end to all Kanghi's efforts to maintain peace. The diplomatic movements were followed by a display of military energy and activity, and the whole northern army, consisting of the eight Manchu Banners, the forty-nine Mongol Banners, and a large force of Chinese auxiliaries, was set in motion across the steppes.