Please note that this is the Narutopedia's article on volume 55 of the manga. If you are looking for the article on chapter 515 then you should head to The Great War Breaks Out!.
After discovering that Akatsuki's forces are moving out, Anko orders her team to return to headquarters, while she searches the enemy base. Kabuto's reincarnated servants discuss the reasoning for their reincarnation. Kabuto forms a Surprise Attack and Diversion Platoon using four of his servants. Afterwards, Kabuto confronts Anko and engages her in battle. Naruto moves on to the next step of his training. Gaara gives an inspiring speech to the shinobi army, which stops the fighting between the troops. Afterwards, the army heads out for war, and the Kage all agree that they will win.
The Surprise Attack Division moves into enemy territory, and Omoi worries about what will happen if he is captured. The allied forces evacuate the lands of Hot Water, and Frost. Anko is defeated by Kabuto. Akatsuki's Surprise Attack and Diversion Platoon engages in battle with the Allied Shinobi Forces Surprise Attack Division. Sai realises that his "brother" has been reincarnated to fight for Akatsuki. Omoi raises his sword, and says that he won't allow the enemy to force friends and family to fight.
After hearing Kankurō's speech, Sasori's body begins to crumble. Before passing on, Sasori entrusts Kankurō with his puppets "Mother and Father", and tells him to pass them on to the next generation. After discussing a potential weakness in the Summoning: Impure World Reincarnation, the team prepares for their ambush. Kabuto tells Tobi to go ahead to the front lines, while he stays hidden, and focuses on his technique. Naruto begins to learn a new technique.