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'''Hive Fleet Behemoth''' was the first [[Tyranid]] [[Hive Fleet]] encountered by the [[Imperium]], and was also the first contact the Imperium had with the [[Tyranid]]s as a race. Behemoth made a juggernaut rush into the [[Galaxy]] from the [[Eastern Fringe]] and proceeded into [[Ultramar]], resulting in what became known as the [[First Tyrannic War]]. ^1a It was eventually destroyed at the [[Battle for Macragge]] in 745.[[M41]]^1a or 746.M41 ^1a4depending on the source.

The first documented attack was upon the outpost of Tyranin 745.M41 ⁴. Hive Fleet Behemoth overran the isolated [[Adeptus Mechanicus]] [[Explorator Base]] with overwhelming force, and stripped the world of all life. A data-codex recording the invasion was stored deep below the base's command bunker and was recovered almost a year later by [[Inquisitor]] [[Kryptman]], a far-sighted Inquisitor who had been dispatched to investigate the reports of unexplained dead worlds. Analyzing the codex, Kryptman realised the grave threat that was entering the galaxy and became determined to warn the Imperium. Being the first time the Imperium had encountered a new alien race, they were named after the planet Tyran.^1b,²