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Four Goguryeo Expeditions! The Largest Military Mobilization in World History!! Why did the Sui Dynasty so persistently undertake the Goguryeo Expedition? Emperor Yang of Sui thoroughly prepared for the Goguryeo Expedition for five years. In order to transport military supplies, he completed the expansion of the Grand Canal connecting the Yangtze River and Beijing, and in 612, he mobilized a million troops and launched a large-scale Goguryeo Expedition. In addition, the supply unit was 2 million people, and the military supplies were loaded onto ships that stretched over a thousand li, making it the largest military force in world history. However, they were defeated by Goguryeo and returned. The mysterious Goguryeo victory! How could this have happened? And why did the Sui Dynasty mobilize such a huge amount of troops to subdue Goguryeo several times? The Goguryeo Victory Strategy! Block the Sui grain transport route! How was Goguryeo able to disrupt the rear of the Sui Dynasty with a million troops? The biggest problem for the Sui army at that time was the transport of military supplies from Takjun, the Beijing area, to the Liaodong Plain, a distance of 2,000 li. There are records in the Zizhi Tongjian and the New Book of Tang that reveal that the Goguryeo army was stationed in the Chifeng area of the Inner Mongolia Autonomous Prefecture, north of Beijing, a Khitan area. If the Goguryeo army stationed in this Chifeng area had come down to Beijing and blocked the grain transport route, it would have been obvious that the Sui army in the Liaodong Plain would have starved to death! The secret to Goguryeo’s mysterious victory was the joint operation with the Khitan to block the Sui grain transport route! How did Goguryeo attack the Sui grain transport route by going thousands of li away? HD History Special Episode 21 – The Mystery of World War History, Goguryeo-Tang War Part 1, Why Did the Million-Man Army of the Sui Army Lose to Goguryeo (Broadcast on September 30, 2005) http://history.kbs.co.kr/