This victory was the culmination of Nobunaga 's Mino campaign Military_operation , waged intermittently over the previous six years , and brought Bringing an end to a rivalry between the Oda clan of Owari Province and the Saitō clan of Mino , which began Process_start over twenty years earlier between Nobunaga 's father , Oda Nobuhide and Saitō Dōsan .