Oda Nobunaga was born on 23 June 1534 in Nagoya, Owari Province, and was the second son of Oda Nobuhide, the head of the powerful Oda clan and a deputy shugo (military governor), and his wife Tsuchida Gozen. Portrait of Oda Nobunaga in Kobe City Museum, circa 1583 However, he died in 1598, and Ieyasu took power after the Battle of Sekigahara in 1600, becoming shogun in 1603, and ending the Sengoku period. Hideyoshi later united Japan in 1591 and invaded Korea a year later. Nobunaga was an influential figure in Japanese history and is regarded as one of the three great unifiers of Japan, along with his retainers Toyotomi Hideyoshi and Tokugawa Ieyasu. Nobunaga was succeeded by Toyotomi Hideyoshi, who along with Tokugawa Ieyasu completed his war of unification shortly afterward. Nobunaga was killed in the Honnō-ji Incident in 1582, when his retainer Akechi Mitsuhide ambushed him in Kyoto and forced him to commit seppuku.
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Nobunaga's rule was noted for innovative military tactics, fostering of free trade, reforms of Japan's civil government, and the start of the Momoyama historical art period, but also for the brutal suppression of those who refused to cooperate or yield to his demands. He conquered most of Honshu island by 1580, and defeated the Ikkō-ikki rebels in the 1580s. Nobunaga emerged as the most powerful daimyō, overthrowing the nominally ruling shogun Ashikaga Yoshiaki and dissolving the Ashikaga Shogunate in 1573. Nobunaga was head of the very powerful Oda clan and launched a war against other daimyō to unify Japan in the 1560s. He is regarded as the first "Great Unifier" of Japan. OODA Loop 2.0: Information, Not Agility, Is Life OODA Loop 2.Oda Nobunaga ( 織田 信長, listen 23 June 1534 – 21 June 1582) was a Japanese daimyō and one of the leading figures of the Sengoku period."Boyd's OODA Loop and the Infantry Company Commander". Video: The OODA Loop and Clausewitzian "Friction".Ullman, David G., "OO-OO-OO!” The Sound of a Broken OODA Loop], Crosstalk, April 2007.Richards, Chet, Certain to Win: the Strategy of John Boyd, Applied to Business (2004) ISBN 1-4134-5377-5.Osinga, Frans, " Science, Strategy and War The Strategic Theory of John Boyd".Metayer, Estelle, Decision making: It's all about taking off – and landing safely…, Competia, December 2011.Linger, Henry, Constructing The Infrastructure for the Knowledge Economy: Methods and Tools, Theory and Practice, p. 449.
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It is especially applicable to cyber security and cyberwarfare. The approach explains how agility can overcome raw power in dealing with human opponents. It is now also often applied to understand commercial operations and learning processes. Boyd applied the concept to the combat operations process, often at the operational level during military campaigns. The OODA loop is the cycle observe–orient–decide–act, developed by military strategist and United States Air Force Colonel John Boyd.