Hashirama Senju vs Uchiha Madara

True to his promise, Madara eventually returned to Konoha with the Nine-Tails under his control, challenging Hashirama to one final contest. The Nine-Tails' power, as well as Hashirama's efforts to capture and contain it, devastated the landscape, carving out what would later be called the Valley of the End. Hashirama spent the duration of their battle trying to reason with Madara, but Madara continued fighting until he was too tired to keep even his Sharingan active. This enabled Hashirama to distract him with a wood clone while the real Hashirama stabbed him in the back. Madara collapsed and, before dying, noted how much Hashirama had changed from when they were children.