User blog comment:Master Sima Yi/Assassinews 05-08-'14 – Assassin's Creed: Rogue announced/@comment-24760042-20140826155839/@comment-1153722-20140826162613

Ninja never were the mortal enemies of samurai. Ninja were covert spies and mercenaries, samurai were military nobility. Ninja and samurai both served feudal warlords.