The war itself was a succession of triumphs for Japan. Four days after the first naval encounter she sent from Seoul a column of troops who routed the Chinese entrenched at Asan. Many of the fugitives effected their escape to Phyong-yang, a town on the Taidong River, offering excellent facilities for defence, and historically interesting as the place where a Japanese army of invasion had its first encounter with Chinese troops in 1592. There the Chinese assembled a force of 17,000 men, and made leisurely preparations for a decisive contest. Forty days elapsed before the Japanese columns converged upon Phyong-yang, and that interval was utilized by the Chinese to throw up parapets, mount Krupp guns and otherwise strengthen their position. Moreover, they were armed with repeating rifles, whereas the Japanese had only single-loaders, and the ground offered little cover for an attacking force. In such circumstances, the advantages possessed by the defence ought to have been well-nigh insuperable; yet a day's fighting sufficed to carry all the positions, the assailants' casualties amounting to less than 700 and the defenders losing 6000 in killed and wounded. This brilliant victory was the prelude to an equally conspicuous success at sea. For on the 17th of September, the very day after the battle at Phyong-yang, a great naval fight took place near the mouth of the Yalu River, which forms the northern boundary of Korea. Fourteen Chinese war-ships and six torpedo-boats were returning to home ports after convoying a fleet of transports to the Yalu, when they encountered eleven Japanese men-of-war cruising in the Yellow Sea. Hitherto the Chinese had sedulously avoided a contest at sea. Their fleet included two armoured battleships of over 7000 tons displacement, whereas the biggest vessels on the Japanese side were belted cruisers of only 4000 tons. In the hands of an admiral appreciating the value of sea power, China's naval force would certainly have been led against Japan's maritime communications, for a successful blow struck there must have put an end to the Korean campaign. The Chinese, however, failed to read history. They employed their war-vessels as convoys only, and, when not using them for that purpose, hid them in port. Everything goes to show that they would have avoided the battle off the Yalu had choice been possible, though when forced to fight they fought bravely. Four of their ships were sunk, and the remainder escaped to Wei-hai-wei, the vigour of the Japanese pursuit being greatly impaired by the presence of torpedo-boats in the retreating squadron.