We have seen that Ko-gu-ryŭ did not respond freely to the friendly advances of the Sui power in China. Although a Sui envoy came and conferred investiture upon the king in 590, yet the relations were not cordial. Something was lacking. A mutual suspicion existed which kept them both on the watch for signs of treachery. But two years later the king did obeisance to the Emperor and was apparently taken into his good graces. And now the net began to be drawn about Ko-gu-ryŭ. Her position had always been precarious. She was the largest of the peninsular kingdoms and the nearest to China. She was also nearest to the wild tribes who periodically joined in an attempt to overthrow the Chinese ruling dynasty. So Ko-gu-ryŭ was always more or less suspected of ulterior designs and she seems to have realised it, for she always sedulously cultivated the good-will of the Emperors. She knew very well that with Sil-la and Păk-je, hereditary enemies, at her back, the day when she fell under the serious suspicion of any strong dynasty in China would be her day of doom. And so it proved in the end. She had now thoroughly alienated the good-will and aroused the suspicions of the Sui Emperor; Sil-la and Păk-je were in his good graces, and stirring times were at hand. These two rival powers sent envoys to China urging the Emperor to unite with them in invading Ko-gu-ryŭ and putting an end to her once for all. To this the Emperor assented. Ko-gu-ryŭ knew that the fight was on and, being the warlike power that she was, she boldly determined to take the offensive. Drawing on her faithful allies the Mal-gal for 10,000 troops she despatched these, together with her own army, to western Liao-tung and across the river Liao, where the town of Yŭng-ju was attacked and taken. This was her declaration of war. The Emperor in 598 proclaimed the royal title withdrawn from the king of Ko-gu-ryŭ and an army of 300,000 men was put in motion toward the frontier. At the same time a naval expedition was fitted out. But reverses occurred; storms by sea and bad management of the commissariat by land rendered the expedition a failure. It opened the eyes of the Ko-gu-ryŭ king however and he saw that the Emperor was fully determined upon his destruction. He saw but one way to make himself safe and that was by abject submission. He therefore hastened to tell the Emperor, “I am a base and worthless subject, vile as ordure,” which was received by the Emperor with considerable complaisancy, and a show of pardon was made; but it was probably done only to keep Ko-gu-ryŭ from active preparations until China could equip a much larger army and put it in the field. Păk-je, who did not like to see affairs brought to a halt at this interesting juncture, sent an envoy to China offering to act as guide, to lead a Chinese army against the foe. When Ko-gu-ryŭ learned of this her anger knew no bounds and she began to make reprisals upon Păk-je territory.