Description of the Donghak Peasant War in historical materials of Japan goes beyond the range of the Korean history and provides overview on the international relationship among Japan, China and Russia, as well as the role of the U.K. that provided intelligence about China to Japan. Such a situation can be clearly understood from the materials about the Japanese army, war declaration draft of the Japanese government, magazines focusing on Ukiyo-e, which was popular among the general public of Japan and articles from local newspapers. General ideas of western visitors to Japan including bishop were not much different.The Donghak Peasant War, or the Sino-Japanese-Korean War as intended by the Japanese government (or another Sino-Japanese War and Korean-Japanese War) to be understood by outsiders, led to suppression by the Japanese army with modern training, especially the 19th battalion, or the Donghakdang punitive force, on the peasants with almost no resistance. The Japanese soldiers were equipped with snider rifles with up to 900m of range of fire. In the meantime, the peasants were mostly general public, with the best weapon being firelocks with mere 50m of range. As professor Cho Gyeong-dal pointed out early, the battle between the two sides can be described as the first overseas massacre in the modern history of Japan. From the viewpoint of modern history of Japan, such oppression on the peasant army aimed to protect the military and the quartermaster corps as well as to stabilize the whole Joseon as Japan’s logistics base. This can be understood in the context of in-depth relation with the Sino-Japanese War.