Uesugi Kagekatsu was a Japanese samuraidaimyō during the Sengoku and Edo periods.
Early life and rise
Kagekatsu was the son of Nagao Masakage, the head of the Ueda Nagao clan and husband of Uesugi Kenshin's elder sister, Aya-Gozen. After his father died, he was adopted by Kenshin. His childhood name was Unomatsu. In 1577, He participated in Battle of Tedorigawa. Upon Kenshin's death in 1578, Kagekatsu battled Kenshin's other adopted son Uesugi Kagetora for the inheritance, defeating him in the 1578 Siege of Otate. He forced Kagetora to commit seppuku, and became head of the Uesugi clan. Kagekatsu married Takeda Katsuyori's sister after the Siege of Otate.
Conflict with Nobunaga
By 1579, Kagekatsu had gained the upper hand and forced Kagetora to commit suicide. This bloody division allowed Oda Nobunaga's generals to conquer the Uesugi's lands in Kaga, Noto, and Etchu. In 1582, Kagekatsu led an army into Etchu and was defeated by Oda forces at the Battle of Tenjinyama. He hastily returned to Echigo when he learned that Oda general Mori Nagayoshi had raided Echigo in his absence. When Oda laid Siege of Uozu castle in Etchu, in the course of which a number of important Uesugi retainers were killed, Kagekatsu's fortunes appeared bleak. Kagekatsu sent a letter to Satake Yoshishige, his allies. It's like a suicide note. The Uesugi were given a reprieve with the death of Nobunaga shortly afterwards.
Kagekatsu made friendly overtures to Toyotomi Hideyoshi, and attacked Shibata Kasuie's northern outposts during the Shizugatake Campaign and went on to support Hideyoshi during the Komaki Campaign, in which he played a limited role by launching a foray into Shinano. As a general under Toyotomi Hideyoshi, Kagekatsu took part in the Siege of Odawara1590 and Korea campaigns 1592-1598, and rise to prominence to become a member of the council of Five Elders. Originally holding a 550,000 koku fief in Echigo Province, Kagekatsu received the fief of Aizu, worth a huge 1.2 million koku when Hideyoshi redistributed holdings in 1598. After Hideyoshi's death, that year, Kagekatsu then allied himself with Ishida Mitsunari, against Tokugawa Ieyasu, as the result of some political dispute.
The Sekigahara Campaign 1600 can be said to have begun, at least in part, with Kagekatsu, who was the first daimyō to plan a revolt against the Tokugawa. He built a new castle in Aizu, attracting the attention of Ieyasu, who ordered him to Osaka, to explain his conduct. Kagekatsu refused, and Tokugawa began plans to lead a 50,000 man army north against him. Ishida and Uesugi hoped to occupy Tokugawa Ieyasu with this fighting in the north, distracting him from Ishida Mitsunari's attacks in and around Osaka. Anticipating this, Ieyasu remained in Osaka to engage Mitsunari; his generals Mogami Yoshiaki and Date Masamune would fight Kagekatsu in Tōhoku. Kagekatsu had intended to move his force south, attacking the Tokugawa from the north-east while Ishida attacked from the west, but he was defeated very early in the campaign, at his castle in Siege of Shiroishi.
