Four hundred years ago, the Imperial court of Japan didn't have much power and there were many warlords everywhere in Japan. They fought each other in order to keep their opponents under their control.
Oda Nobunaga beat most of his opponents and almost succeeded in keeping his all opponents under his control, but he was assassinated by his subordinate just before his final victory.
Toyotomi Hideyoshi was a distinguished subordinate of Oda, he fought against and beat Oda's subordinate who assassina