In March (in the old calendar) of 1600, Ieyasu was informed by Hideharu HORI in Echigo Province and by Yoshiaki MOGAMI in Dewa Province that Kagekatsu UESUGI in Aizu Province was making a disquieting movement of increasing armaments.
慶長5年（1600年）3月、越後国の堀秀治、出羽国の最上義光らから、会津の上杉景勝に軍備を増強する不穏な動きがあるという知らせを受けた。