Since the wife of Josui's heir Nagamasa was an adoptive daughter of Ieyasu, Nagamasa became an ally of Ieyasu around the time of Hideyoshi's death and recruited many daimyo from Toyotomi's side to Ieyasu's side.
嫡男・長政は家康の養女を正室として迎えていたことから秀吉の死去前後から家康に与し、豊臣恩顧の大名を多く家康方に引き込んだ。