"Reinforcements Arrive…!!" (増援到着…!!, Zōen Tōchaku…!!, Viz: Reinforcements…!!) is chapter 559 of the original Naruto manga.
Mū finishes summoning Kabuto's trump card, whose power makes the coffins lid burst open. The figure gets out of the coffin, figuring Nagato grew. Mū is impressed that someone would bring this person back with Impure World Reincarnation. The summon is confused, thinking it had been brought back with Outer Path: Samsara of Heavenly Life Technique. Naruto finishes off the White Zetsu attacking Hinata. Neji and Kiba notice how Naruto is different, and wonder if it's really him. Hinata is convinced it's Naruto, and has her confidence shaken by the fact the one she wishes to protect ends up protecting her instead. Naruto reassures her that she's strong, and begins fighting the White Zetsu. Kakashicuts through Fuguki Suikazan, creating an opening for Sai to seal him. Guy says there are three more reincarnated shinobi to be sealed. Lee says he'll cover for Sai. Many White Zetsu arrive at the Third Division's location, but so does one of Naruto's clones. Naruto decides to go for quality instead of quantity. Another clone reaches Mifune's division, preparing to fight Kimimaro and Chiyo, who notice his growth. A clone reaches Mei's group and begins fighting Black Zetsu. Inoichi receives reports from all divisions, that Naruto is identifying and defeating all White Zetsu. Shikaku thinks they should focus their efforts on finding and capturing Madara. Ao detects a presence near Gaara's division. A local sensor detects Mū's split double, Ōnoki is impressed he managed to do that just before being sealed. Mū is joined by a reincarnated Madara Uchiha, causing all to wonder who is the man behind the mask, leading the opposing side in the war.