Tan Zhengchang, the fourth minister of Takeda and one of the twenty-four generals of Takeda, believes that he is a young tiger in spring, that he is the guardian of the country's entry into the city, and that Xuan is a servant. He used his troops calmly, and he was able to get away with it without a blow. People call it an "escaped bullet". The son of Hironong Izawa of Japan is an official in Takeda. Astronomy in 2 1 (1552) as a general, the following year as a small town in Nong Xin. In the second year of Hongzhi (1556), he became the owner of the city, guarding the area around Nakagawa Island and fiefdom 75,000 stones. In the fourth year of Lu Yong (156 1), Takeda Shingen ordered him to inherit the Takasaka family. In the same year, he served as the commander-in-chief of the wife and daughter mountain attack team in the fourth Chuanzhong Island War. Joined the new Xuan Shangluo Army and was active in the three-way original war. In the battle of filial piety, Sugiyama defended the new farmers in the north. He is the author of the Military Sword of Yang Jun, and is known as the ancestor of the study of A soldiers.