This study examines the actions of Yi Sun-sin of Chungmugong and the military thought that emerged through war with a modern perspective on military thought theory. The scope of the study is a prior study of military strategies and tactics, national views, and philanthropy that were shown in books such as 『Nanjung Ilgi(亂中日記)』, 『Jingbirok(懲毖錄)』, 『The Sea of Admiral Yi Sun-sin』 and papers published in various academic journals in the process of preparing for war and conducting war. Based on the preceding studies, Yi Sun-sin's military thought was examined by Kim Yu-seok's military thought theory, focusing on the Imjin War, the great Myeongnyang sea war battle, and the Noryang sea war battle.
As a result of the study, the military thought of Admiral Yi Sun-sin can be examined in the first, the recognition and understanding of the essence of war in Well-prepared Posture (萬全思想), Short war (速勝思想), and Made-up Win (制勝思想). His belief in war can be seen in Yi Sun-sin's military genius. There was also the idea of an all-out war effort to overcome the national crisis through integrated defense operations. Second, recognizing that qualitative expansion is more important than quantitative expansion and that Intangible fighting power is more important than tangible fighting power, the military power construction has been prepared with confidence. In training, creative methods and Military art were used to put into practice after repeated training. In particular, Admiral Yi Sun-sin had a creative military innovation mind and used new weapons such as the turtle ship. Third, in terms of mercenaries, Yi Sun-sin made a decisive contribution to ending the war with his excellent leadership and military force operation. In terms of the national strategy between the Battle of Myeongnyang, the Japanese forces were destroyed at sea, blocking the maritime supply route and the strategic goal of occupying Jeolla-do. Tactically, the Hakinjinbeop (鶴翼陣法) was changed in various ways according to the situation to change the Uhlinhakik (魚鱗鶴翼) form, or based on this, the Paljingimunbeop (八陣奇文法) with a combination of unity and dispersion was used. Fourth, in terms of supporting national security in peacetime, Yi Sun-sin provided a place for refugees to live and could get the ideology of Ae-min (愛民) Patriotism that guarantees safety. Fifth, in terms of military force operation as a means of supporting national policy, Yi Sun-sin sent the body to his hometown in the event of a dead person and implemented relief measures for widows and their families. Sixth, in terms of effective and efficient military force management and operation during peacetime, Yi Sun-sin was able to use civilian fishing boats and civilians militarily in wartime based on the trust in the army formed during peacetime. did.
Yi Sun-sin's military thought, which compressed the core ideas analyzed by category, can be said to be 'a fast and decisive war through military innovation and mission-type command as a national total war'. This study of Yi Sun-sin's military thought will be a useful resource for establishing the theory of modern military thought and establishing national security and military strategies.