"Omoi's 'War'!!" (オモイの｢戦争｣!!, Omoi no 'Sensō'!!) is chapter 517 of the original Naruto manga.
Summary
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. Zaji senses the chakra of a konohagakure shinobi (Muta Aburame) and goes to help him, Muta. 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.