石山本願寺
In 1576, after Harada Naomasa's death during the campaign against the heavily fortified and well-supplied Honganji temple in Osaka, Sakuma was chosen as Harada's replacement as part commander of the Siege of Ishiyama Hongan-ji and given troops from seven provinces placing him in command of the largest Oda-clan army among the Oda retainers. However, unlike his colleagues Akechi Mitsuhide, Shibata Katsuie or Hashiba Hideyoshi who all won battles on the fronts to which they were assigned, Nobumori made no progress against the fearless Buddhist zealots. After ten years of warring, Nobunaga had the emperor mediate a truce to end the war in 1580.