Fourth Shinobi World War: Confrontation

The Shinobi World War Arc spans at chapter 515 to current. It covers the Fourth Shinobi World War where the Five Great Shinobi Countries all ally into the Allied Shinobi Forces to oppose Madara Uchiha and Akatsuki, all to protect the last two jinchūriki, Naruto Uzumaki and Killer Bee. The War arc formally began in chapter 516 with the war finally starting with both the Allied Shinobi Forces and Akatsuki moving out for battle.

Battle of the Ambush Squads
The first battle to happen in the war was when the two Ambush Squadrons met in battle. Kankurō lead the Surprise Attack Division against Sasori, Deidara, Chūkichi and Shin of the Surprise Attack and Diversion Platoon, having been resurrected by Kabuto Yakushi to fight in the War. Shin tried resisting the control, yet attacked against his will against his own brother Sai and his comrades. Through clever maneuvering and strategy, as well as Deidara enraging Sai, both Deidara and Sasori were captured in Kankurō's Black Secret Technique: Machine Triple Shot.

After seeing the picture finished in Sai's picture book, Shin's ties to the world were severed and he could pass on, breaking the Summoning: Impure World Resurrection. Chūkichi was returning to reinforce Deidara and Sasori. Sasori is then released from the summoning thanks to Kankurō in much the same way as Shin. With the new found information about how to release the Summoning: Impure World Resurrection by freeing the soul, Kankurō prepares his team to launch their ambush.

Elsewhere, Madara Uchiha meets up with Kabuto, who still holds onto Anko Mitarashi's unconscious body with his snake. Kabuto sensed that Sasori and Shin were released from his technique, having good feeling about how things are going well with his plan. He tells Madara to go ahead to the front lines while he keep hidden and focused on his technique. Gazing at Anko, Madara realizes that Anko was able to veered incredibly close to his hideout and Kabuto knew about it, figuring that Kabuto must have led her there as part of his plan for him and the Allied Shinobi Forces to take each other out. However, Madara quietly states that in the end, Kabuto isn't using him, but he is the one using Kabuto.

Killer Bee attempts to teach Naruto the Tailed Beast Ball, but Naruto cannot turn into the Nine-Tails because his bond with it is weak. The Eight-Tails then explained to Naruto that whenever he uses the Nine-Tails' chakra he stocks his own and the Nine-Tails can steal it, in the end Naruto could lose it all and die if he uses the chakra constantly, and using shadow clones speeds up the process, making them useless. The Eight-Tails explained that him and Bee were able to compromise on how much chakra each would take from the other, eliminating the risk. Naruto decides to focus on his own skills with the Nine-Tails chakra, trying to perform the Rasengan using the fox's chakra shroud to make extra hands in lieu of shadow clones. Killer Bee notices the technique is similar to the Tailed Beast Ball, and upon learning it was created by the Fourth Hokage, he tells Naruto to keep on working on it.

While the ambush squad members were waiting to attack the incoming enemy force, they encountered Zabuza, Haku and two other ninja. Haku was about to use Demonic Ice Crystal Mirrors when Kakashi arrived in time to help. Zabuza and Haku then had a brief chat with Kakashi until Kabuto brought a dramatic change to his Impure World Resurrection, turning Zabuza and the three into mindless slaughter machines. Zabuza, Haku, Gari, former member of Explosion Corps from Iwagakure, like Deidara, and Pakura, kunoichi with kekkei genkai from Sunagakure attacked Kakashi's army with no hesitation cruelly. Then, Kakashi said he got an idea of enemy's tactics and it's their turn for the counter-attack. But Kabuto didn't even give them a chance, having Gari and Pakura summon a previous generation of the Seven Ninja Swordsmen of the Mist.