The story of Japan's relations with Korea throughout the period of over a century, from the accession of Kimmei (540) to the abdication of Kogyoku (645), is a series of monotonously similar chapters, the result for Japan being that she finally lost her position at Mimana. There was almost perpetual fighting between the petty kingdoms which struggled for mastery in the peninsula, and Kudara, always nominally friendly to Japan, never hesitated to seek the latter's assistance against Shiragi and Koma. To these appeals the Yamato Court lent a not-unready ear, partly because they pleased the nation's vanity, but mainly because Kudara craftily suggested danger to Mimana unless Japan asserted herself with arms. But when it came to actually rendering material aid, Japan did nothing commensurate with her gracious demeanour. She seems to have been getting weary of expensive interference, and possibly it may also have occurred to her that no very profound sympathy was merited by a sovereign who, like the King of Kudara, preferred to rely on armed aid from abroad rather than risk the loss of his principality to his own countrymen. At all events, in answer to often iterated entreaties from Kudara, the Yamato Court did not make any practical response until the year 551, when it sent five thousand koku of barley-seed (?), followed, two years later, by two horses, two ships, fifty bows with arrows, and--a promise. Kudara was then ruled by a very enterprising prince (Yo-chang). Resolving to strike separately at his enemies, Koma and Shiragi, he threw himself with all his forces against Koma and gained a signal victory (553). Then, at length, Japan was induced to assist. An omi was despatched (554) to the peninsula with a thousand soldiers, as many horses and forty ships. Shiragi became at once the objective of the united forces of Kudara and Japan. A disastrous defeat resulted for the assailants. The Kudara army suffered almost complete extermination, losing nearly thirty thousand men, and history is silent as to the fate of the omi's contingent. Nevertheless the fear of Japanese vengeance induced Shiragi to hold its hand, and, in the year 561, an attempt was made twice to renew friendly relations with the Yamato Court by means of tribute-bearing envoys. Japan did not repel these overtures, but she treated the envoy of the victorious Shiragi with less respect than that extended to the envoy of the vanquished Kudara.