"An Immortal Army!!" (不死身軍団!!, Fushimi Gundan!!, Viz: The Immortal Corps) is chapter 545 of the original Naruto manga.
Tobi recalls Kisame's report and says that Naruto's ability to sense negative emotions is the same as Mito Uzumaki. He then moves out with the new Six Paths of Pain. At the Logistical Support and Medical Division camp, Shizune and Sakura complete an autopsy on one of the White Zetsu clone. They learn that Zetsu was created from the cells of the First Hokage, and that they all use Wood Release. Shikaku informs Naruto and B of the enemies strategy. Naruto and B are confronted by several White Zetsu disguised as alliance shinobi. Naruto immediately sees through it and kills them. After he's finished he forms multiple shadow clones, which simultaneously head to all the battlefields.