The Battle at the Valley of Clouds and Lightning!! (雲雷峡の闘い!!, Unraikyō no Tatakai!!) is chapter 410 of the original Naruto manga.
Naruto is worried by Gamakichi's claim that he must die, but Fukasaku assures him this is just a terrible analogy. To become one with nature, and thus master senjutsu, Naruto must learn to be perfectly still and take in natural energy. A special oil can help him with this, but it runs the risk of turning him first into a toad and then into a statue if he is not careful. Naruto decides to go through with it, determined to be just as great as Jiraiya. Meanwhile, Taka locates Killer B, the Eight-Tails' jinchūriki. When Suigetsu and Jūgo prove no match for him, Sasuke steps in.