An incompetent general, as above mentioned, had been sent at the instance of the eunuchs to supersede an officer who had been holding his own with considerable success, but who was not a _persona grata_ at court. The new general at once decided that no territory outside the Great Wall was to be held against the Manchus, and gave orders for the immediate retirement of all troops and Chinese residents generally. To this command the civil governor of Ning-yüan, and the military commandant, sent an indignant protest, writing out an oath with their blood that they would never surrender the city. Nurhachu seized the opportunity, and delivered a violent attack, with which he seemed to be making some progress, until at length artillery was brought into play. The havoc caused by guns at close quarters was terrific, and the Manchus fled. This defeat was a blow from which Nurhachu never recovered; his chagrin brought on a serious illness, and he died in 1626, aged sixty-eight. Later on, when his descendants were sitting upon the throne of China, he was canonised as T'ai Tsu, the Great Ancestor, the representatives of the four preceding generations of his family being canonised as Princes. Nurhachu was succeeded by his fourth son, Abkhai, then thirty-four years of age, and a tried warrior. His reign began with a correspondence between himself and the governor who had been the successful defender of Ning-yüan, in which some attempt was made to conclude a treaty of peace. The Chinese on their side demanded the return of all captured cities and territory; while the Manchus, who refused to consider any such terms, suggested that China should pay them a huge subsidy in money, silk, etc., in return for which they offered but a moderate supply of furs, and something over half a ton of ginseng (_Panax repens_), the famous forked root said to resemble the human body, and much valued by the Chinese as a strengthening medicine. This, of course, was a case of "giving too little and asking too much," and the negotiations came to nothing. In 1629, Abkhai, who by this time was master of Korea, marched upon Peking, at the head of a large army, and encamped within a few miles from its walls; but he was unable to capture the city, and had finally to retire. The next few years were devoted by the Manchus, who now began to possess artillery of their own casting, to the conquest of Mongolia, in the hope of thus securing an easy passage for their armies into China. An offer of peace was now made by the Chinese Emperor, for reasons shortly to be stated; but the Manchu terms were too severe, and hostilities were resumed, the Manchus chiefly occupying themselves in devastating the country round Peking, their numbers being constantly swelled by a stream of deserters from the Chinese ranks. In 1643, Abkhai died; he was succeeded by his ninth son, a boy of five, and was later on canonised as T'ai Tsung, the Great Forefather. By 1635, he had already begun to style himself