During the Warring States period in Japan, many outstanding figures left profound marks on the stage of history. Among them, Takeda Shingen and the Three Great Warriors of the Warring States (Oda Nobunaga, Toyotomi Hideyoshi, and Tokugawa Ieyasu) are widely celebrated as warriors of the era. However, Takeda Shingen is not considered one of the Three Great Warriors, and there are reasons behind this. Firstly, the periods of activity of Takeda Shingen and the Three Great Warriors do not overlap completely. Takeda Shingen was primarily active in the first half of the 16th century, while the Three Great Warriors were mainly active in the latter half of the 16th century to the early 17th century. Therefore, from a timeline perspective, Takeda Shingen did not have a direct competitive or cooperative relationship with the Three Great Warriors. Secondly, although Takeda Shingen was an outstanding warrior of the Warring States period, his sphere of influence was primarily limited to the regions of Kai Province (present-day Yamanashi Prefecture) and Shinano Province (present-day Nagano Prefecture), and he did not have the widespread influence over Japan like the Three Great Warriors. Takeda Shingen was renowned for his outstanding military talent and the banner insignia of "Fūrin Kazan" (Wind, Forest, Fire, Mountain), but he did not succeed in unifying Japan or establishing a long-term regime like the Three Great Warriors. Finally, the Three Great Warriors are collectively referred to as "the Three Great Warriors" because they played crucial roles in the political landscape of Japan during the late Warring States period. Oda Nobunaga expanded his territory through a series of wars, Toyotomi Hideyoshi inherited Nobunaga's legacy and achieved the initial unification of Japan, and Tokugawa Ieyasu established the Edo Shogunate, ushering in the Tokugawa period that lasted for over 260 years. The achievements and influence of these three warriors surpassed Takeda Shingen. In summary, the reasons why Takeda Shingen is not considered one of the Three Great Warriors of the Warring States are primarily due to his period of activity, sphere of influence, and influence in Japanese history, which differ from the Three Great Warriors. Nonetheless, Takeda Shingen remains a respected and outstanding figure in the Warring States period of Japan, and his deeds and talents are still celebrated by later generations. By understanding the story of Takeda Shingen, we can gain a deeper understanding of the complexity and diversity of the Warring States period in Japan.

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