After the Battle of Nagashino, Ieyasu heard a heartbreaking story from his adopted son-in-law Nobumasa that hostages were sacrificed during his time serving the Takeda clan.
長篠の戦いの後、娘婿となった信昌から武田氏臣従時の人質を犠牲にした悲話を、家康は耳にした。