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*The '''First Tyrannic War''' (745 M41): The Imperium makes first contact with the Tyranid race when [[Hive Fleet Behemoth]] invades the [[Eastern Fringe]] and annihilates planet [[Tyran]]; Behemoth is defeated, though at great cost, by the [[Ultramarines]] at the [[Battle for Macragge]].
*The '''Second Tyrannic War''' (990-993 M41): Hive Fleet [[Kraken]] invades and is, again, narrowly defeated.
*The '''Third Tyrannic War''' (997.M41-~early.[[M42]]Present): Hive Fleet [[Leviathan]], the largest Tyranid force yet, invades.
Collectively, the Tyrannic Wars have seen a massive mobilization of Imperial forces and is among the highest prioritized conflicts in the Imperium. Deployed primarily to the [[Eastern Fringe]], casualties among [[Imperial Guard]] [[regiment]]s have been so high that it seems as if the Tyranids are annihilating them faster than they can be deployed.{{Fn|1}}
