It was in 436 that P’ung-hong, the “Emperor” of Yun, found himself so weak that he could not withstand the pressure from the Chinese side and asked the king of Ko-gu-ryŭ to grant him asylum. Consent was given and an escort was sent to conduct him to the Ko-gu-ryŭ capital. He found that this sort of life had its drawbacks; for, to begin with, the king did not address him as emperor but simply as king. This was a great affront to his dignity and, though he was treated very handsomely, he assumed such a supercillious bearing that the king had to curtail his retinue and his income. He had been given quarters in Puk-p’ung and from there the mendicant emperor applied to the Sung Emperor for asylum. It was granted, and seven thousand soldiers came to escort him; but ere they arrived the king of Ko-gu-ryŭ sent two generals, Son-su and Ko-gu, who killed the imperial refugee and nine of his attendants. The Sung troops, arriving on the instant, discovered the crime and caught and executed the two generals who had perpetrated it. In 449 a Ko-gu-ryŭ general was out on a hunting expedition and the chase brought him into Sil-la territory near the present town of Kang-neung. The prefect of the district, in an excess of patriotic enthusiasm, seized him and put him to death. An envoy came in haste to the Sil-la capital demanding why this outrage had been committed. War would have been declared on the spot had not Sil-la been profuse in apologies. She might have spared herself this humiliation for war was sure to break out soon in any case. When ng came to the throne of Păk-je in 455, Ko-gu-ryŭ took advantage of the confusion, consequent upon the change, to attack her. Sil-la, who, though ordinarily a peaceful power, had been perforce drawn into war-like operations and had acquired some military skill, now sided with Păk-je. Sending a considerable number of troops she reinforced Păk-je to the extent of warding off the threatened invasion. But Păk-je, though glad to find herself extricated from her position of danger, would allow no feelings of gratitude to stand in the way of her ancient feud against Sil-la; so this act of friendship not only did not help toward peace but on the contrary, by showing Sil-la the fickleness of Păk-je, made peace all the more impossible. The middle of the fifth century marks the point when all friendly relations between the three Korean states were broken off and an actual state of war existed between them from this time on, though active military operations were not constant. This we may call the Triangular War.