Sui Dynasty centered world order existed asJapanese scholars insisted,but it was incomplete and didn't last long. Japanese king sent a diplomatic message to the emperor of China. Chinese emperor sent a message in reply to the king of Japan, But Baeje seized the message in the presence of the Chinese envoys. In 601 Japan proposed Goguryeo and Baekje to attack Shilla. In March,602, the Japanese army of 25,000 troops assembled in Kyushu(九州) to attack Shilla. Baekje's 40,000 troops were gathering in Namwon(南原). baekje's first military action began in August, 602. Baekje attacked Shilla at Ahmak fort located in Jiri Mt.Silla army counterattacked and defeated Baekje while the Japanese and Koguryo armies were being delayed. Japan did not keep the promise to attack Shilla, because the commander was sick. Att he time, Goguryeo was facing dramatic changes in their area and delayed dispatching its army for a year. Baekje blamed Koguryo and Japan. Baekje had severed diplomatic relations with Japan.In 607 Baekje proposed Sui Dynasty to attack Goguryeo. Sui emperor welcomed Baekje’s proposal. In 608, Baekje had captured the Japanese ship and diplomatic documents were seized. It undermined the authority of the Sui emperor who believed China was at the center of world. The Chinese emperor tolerated the fact that Japan did not keep its promise, because the emperor needed Japanese forces to attack Koguryo. In 610, Shilla sent an envoy to Japan, and Japanese emperor warmly welcomed the envoy because Japan could not maintain hostile relationship with Shilla when Japan's relationship with Baekje was worsening