Wars and battles that have occured throughout the in-game history of the Metroid series.
“The Horus Rebellion was an intense skirmish mentioned by G.F.S. Olympus crewmen in Metroid Prime...Horus Rebellion
“The "Species War" is a conflict mentioned by P-1 while being interrogated in the Metroid Manga...Species War
“The Tetra Border Wars was an unknown event that apparently took place in the Alimbic Cluster...Tetra Border Wars
“The Battle of the Hive was an unseen event that can be presumed to be either the Ing's takeover...Battle of the Hive