War arcs are a common occurrence in lots of manga and when it comes to battle shonen, it's the perfect kind of arc to get every single fan excited as, more often than not, fans tend to love the action that they deliver. From Naruto's Fourth Great Ninja War, My Hero Academia's Paranormal Liberation War arc, there are several stories out there that feature major wars in stories, and while all of them certainly are great in their own ways, hardly any story can deliver a war arc as incredibly as Eiichiro Oda did with One Piece's Marineford.