However, the second battle, under a situation where military conflict (the Battle of Sekigahara) between the Toyotomi side (Western Camp) and Tokugawa side (Eastern Camp) was inevitable, stems from the fact that Masayuki and his second son Nobushige sided with Toyotomi side (Western Camp).
しかし、第二次では豊臣方（西軍）と徳川方（東軍）の軍事衝突（関ヶ原合戦）が避けられない状況下で、昌幸と昌幸の二男信繁が豊臣方（西軍）についたことが起因している。