Simultaneously, Nobunaga had been besieging the Ikkō-ikki's main stronghold at Ishiyama Hongan-ji in present-day Osaka. Nobunaga's Siege of Ishiyama Hongan-ji began to slowly make some progress, but the Mōri clan of the Chūgoku region broke his naval blockade and started sending supplies into the strongly fortified complex by sea. As a result, in 1577, Hashiba Hideyoshi was ordered by Nobunaga to confront the warrior monks at Negoroji, and Nobunaga eventually blocked the Mōri's supply lines.