The Reanimated Allied Forces

is episode 316 of the Naruto: Shippūden anime.

Summary
In a attempt to recover his most powerful pawns, Kabuto reincarnated some of his weakest dead soldiers to ambush the Shinobi Alliance. He used Torune to summon them. White Zetsu appeared in the battlefield, and he realised that those were Impure World Reincarnation's failures.