1547, Song Pinghong played against Zhang Wei's Oda Nobuhide. In order to seek help from Imagawa Yoshimoto of Suruga, he sends six-year-old Konka as a hostage in Imakawa, but he is captured by Toda (Toda Yasuhiro) on the way. With Amano's help, Chiyo Abe was sent to Hotan of Oda clan, where he was detained for two years (one said in Nagoya). During this period, his father Guangzhong was assassinated by his trusted minister. 1549 qwe rty, who served as Imakawa's military adviser, commanded 7000 troops to capture Anxiang City at the intersection of Sanjiang, and captured the garrison commander Oda Shinbo alive. Xuezhai then negotiated with Nobuhiko Oda, and successfully exchanged Nobuhiro for Chiyo Matsuhira (Tokugawa Ieyasu). Tokugawa Ieyasu returned to Okazaki, and on 10, he became the hostage of Imakawa. From 8 years old to 19 years old 12 years old, Tokugawa Ieyasu lived in Suruga as a hostage.

1560, in the battle of narrow barrels, Nobuyasu Oda was defeated by Imakawa and Imagawa Yoshimoto was killed. From then on, Tokugawa Ieyasu got rid of today's Ishikawa and became independent. 1562 formed an alliance with nobunaga Oda and began to manage Sanjiang in an all-round way. Due to the support of Hirotaro Takeuchi and others and the instigation of various monasteries, an uprising broke out all over the Three Rivers in 1563. After nearly half a year's campaign, he finally disintegrated the uprising and consolidated his ruling foundation through attack.

1568, Tokugawa Ieyasu's ally, Nobutaka Oda, entered Kyoto and took the first step to unify the whole country. At this time, Tokugawa Ieyasu, which has laid a solid foundation in Sanjiang, began to adopt the eastward policy. 1570 defeated Asai and asakura in "Chuanmeizi", which was called "Battle of Chuanmeizi" in history. Later, he led the army to conquer the hemp leaves in Yuanjiang and moved the station to hemp leaves (renamed Hamamatsu when he moved to the city). But at this time, Takeda Shingen also wants to seize the national power. In order to clear the obstacles on the March, he sent troops to Yuanjiang and Sanhe many times.

1572 10, 35,000 soldiers from Takeda Shingen, Jiafei, Nong Xin and Hejun marched into Kyoto, but passed through the Three Rivers in Tokugawa Ieyasu. Tokugawa Ieyasu, hearing the news, led his five thousand men and Oda Nobunaga's reinforcements to attack Sanyuan. This war is called "Three-way Original War". Due to the disparity in strength between the two sides and the clever use of troops, the allied forces of Tokugawa and Oda were defeated, and Oda aid general Fan Xiu died. The Tokugawa family suffered casualties 1600 people, and his men dressed as Tokugawa Ieyasu in four batches, which attracted the troops of Xinxuanjun. Tokugawa Ieyasu fled back to Hamamatsu himself. Although Tokugawa Ieyasu was defeated, Takeda Shingen admired the courage and tenacity of the Tokugawa army. Takeda Shingen's fierce general Xinchun (also known as Xinchun in Racecourse) said to Xin Xuan afterwards: "After seeing the bodies of the Sanhe Army, those who fell facing our army were all face down, and those who fell facing Hamamatsu were all face up. This shows that these soldiers all died when they rushed forward, and none of them were beheaded because they wanted to escape." It is said that it was through this campaign that Tokugawa Ieyasu won the reputation of "a male in the sea".

Since then, while confronting the Takeda family, Tokugawa Ieyasu has strengthened its construction in the territory. 1575 In May, after Takeda Shingen's death, he inherited Takeda's winning percentage from Takeda's family 15000 people and attacked Long Island with 500 people stationed in Aoping Xinchang. The Tokugawa family jointly intended to destroy the Takeda clan in one breath, greatly defeated Takeda in the battle of Long Island, and drove Takeda family out of Yuanjiang at 158 1. In the second year, Takeda's family, the Yokota clan, was destroyed together, and Hejun was owned.

Nobunaga Oda died in Beno Temple on 1582. Nobunaga died, and there was a fierce struggle among the famous names around who the regime fell into. Tokugawa Ieyasu was in Sakai City (also known as "Sakai Port") when Honnoji Temple changed. In order to take a shortcut, he had to return to Sanhe via Yi Shi. During this period, he was safely escorted back to Sanhe by Hattori Shimada Hanzo and teahouse Kojiro to avoid danger.

After Tokugawa Ieyasu returned to Okazaki, he was about to send troops to attack Akechi Mitsuhide. Unexpectedly, Hideyoshi Hatoyama (after Toyotomi Hideyoshi) beat Akechi Mitsuhide out of the water and gained real power in the central region. Tokugawa Ieyasu preserved his strength for future competition with Toyotomi Hideyoshi, and also strengthened his determination to move eastward. Soon he sent troops to occupy Jia Fei and put his hand into Xinzhou. By about 1583, Tokugawa Ieyasu had successively incorporated Sanhe, Yuanjiang, Hejun, Garfield, Shikoku and Sinava into its sphere of influence.

At that time, the separation of soldiers and farmers in Donghai Road was very slow, and there was no famous Shimonoseki town like Otani and Beidao. Governors and their fiefs are still closely linked, so to control governors, we must firmly control the land. In view of this situation, Tokugawa Ieyasu adopted the form of enfeoffment to all vassals at that time, and controlled them through land ties.

During this period, Tokugawa Ieyasu also attached great importance to the development of industry and commerce in its territory. As early as in Sanjiangyuan Prefecture, he regarded the Xiaoshan New Town in Sanjiangyuan as a "music market" and exempted from various taxes and tariffs. After moving to Hamamatsu, he reorganized various industrial and commercial organizations. After conquering Jia Fei, it unified the weights and measures of the whole Jia Fei and attracted foreign businessmen to trade in Sanhe and Yuanjiang. Through these measures, Tokugawa Ieyasu not only stabilized its control over the new territory, but also strengthened its economic strength.

Since then, Toyotomi Hideyoshi has promoted domestic reunification step by step, and soon became the minister of Guan Bai and Zheng Tai, and really mastered the state power. Toyotomi Hideyoshi and Tokugawa Ieyasu naturally became a relationship similar to the master-slave relationship.

When Toyotomi Hideyoshi conquered Kyushu, Tokugawa Ieyasu was not drafted into the army and got rid of huge consumption. But he took part in the battle when 1590 conquered Odahara. After the demise of the North Island, Tokugawa Ieyasu was sealed in Guanbazhou, with an annual tribute of 2.557 million stone. On August 1590, Tokugawa Ieyasu left the Five Kingdoms and moved to Edo (now Tokyo). Since then, he has taken a series of measures to comprehensively manage Kanto.

First, a new way is adopted to distribute the retainer. In Musashi, Sagami and other places near Edo, Tokugawa Ieyasu concentrated subordinate ministers directly under the central government and fiefs below ten thousand stones. The senior courtiers above Shiwan are arranged as far as possible, with a slightly thinner distribution density in the southwest of Kanto and a higher density in the border area bordering hostile names in the east. Obviously, this configuration is a combat system. And when he entered Kanto, he decided to convert the fief into output and send it to the retainer. These measures have played a great role in further controlling the retainer and consolidating the new territory of Kanto.