Will of Stone (石の意思, Ishi no Ishi) is chapter 575 of the Naruto manga.
Ōnoki attacks Madara with a giant rock golem, which Madara destroys, creating several flowers. Tsunade recognises the technique as her grandfather's. Gaarasuspends the Kage above the attack, Ōnoki levitating A. The flowers begin releasing a toxic pollen. Kabuto muses on how people who heard of Hashirama Senju's strength consider it a myth, just like the Sage of the Six Paths, and that he'll show everyone that this is real. Dodai, Genma, and Raidō give chase to Mū. Having steered the Kage's attention towards the flowers, Madara uses Susanoo to knock them down from behind, throwing them at the flowers, and proceeds to set the forest ablaze. Mei tries putting out the fire, but collapses due to the pollen, as do the other Kage. Ōnoki thinks back to his youth, talking to the First Tsuchikage about the strong will of Iwa shinobi. Ōnoki musters enough strength to destroy the flowers and injure Madara. The other Kage regain consciousness just in time to see the face formed from the DNA of the First Hokage in Madara's chest. Kabuto gushes on how Orochimaru's experiments are nothing compared to his ultimate trump card. Elsewhere, Sasuke detects someone in the woods nearby. Taking out his sword, he goes to investigate it, only to be shocked at seeing Itachi.
In this chapter while talking to a young Ōnoki, Madara is seen with his Mangekyō Sharingan. According to the timeline of events which stated that Madara transplanted Izuna's eyes before the peace treaty between the Uchiha and Senju and as a result, the founding of the first hidden village, however, he should have already had his Eternal Mangekyō Sharingan.