The ninja world in Naruto has experienced many conflicts, but the Fourth Great Ninja War united the great nations against a common foe. The Allied Shinobi Forces battled a Madara impostor and an army of White Zetsus, but they also had to contend with Kabuto and his army of reanimated ninja. Kabuto reanimated some of the strongest ninja in history, but there are a few notable individuals who he did not bring back.
Source：https://www.cbr.com/naruto-ninja-kabuto-should-have-ressurected-4th-great-ninja-war/
