This conflict happened because of neither heirs being born with the Uesugi name.
Before the situation could escalate into an armed conflict, Takeda Katsuyori acted as the mediator between those two.
Therefore, eventually the Uesugi was divided for a military conflict.
Thus, on April 23, 1578— the 17th day of the 3rd month of Tensho 6 on the Japanese lunar calendar— Uesugi Kagekatsu led a force from his castle at Kasugayama to besiege Otate castle .
Kagetora tried to return to Odawara but committed seppuku in Samegao Castle,[2] and Kagekatsu claimed the full inheritance.