Japanese military history spans centuries, beginning with the samurai warriors in the feudal era. The shogunate system established military leaders known as shoguns, who ruled Japan while the emperor held a ceremonial position. This period saw the rise of various clans and significant battles, shaping Japan's political landscape. In the 19th and 20th centuries, Japan underwent rapid modernization, leading to its emergence as a military power. The country engaged in conflicts such as the First Sino-Japanese War and World War II, ultimately resulting in significant changes to its military structure and international relations after its defeat in 1945.