Tau Xenocide

The Tau Xenocide was a successful xenocidal campaign carried out by the company from the Astral Leviathans Chapter against the upstart Tau Empire on the former Imperial world of Haridanse. The Chapter eagerly prosecuted a brutal, genocidal campaign against the traitorous Gue'Vesa 'Tau lovers' as well as reinforcing Tau forces in only a matter of months, reclaiming the lost world once again for the Imperium of Man.

History
The Astral Leviathans' 4th Battle Company clashes with Tau forces after perusing reports of Gue'Vesa on the planet of Haridanse. Upon arrival in the Osryius System the company fleet intercepted a small Gue'Vesa fleet in orbit over Haridanse, the Astartes made quick work of the traitorous fleet shattering the ancient Imperial war ships and sending the fragments of once mighty vessels to the planet's surface below in a catastrophic meteor shower. After the short battle just out of orbit the drop pods and thunderhawk gunships made planetfall in a rapid strike deployment, the doors rolling back to unleash the zealous Astartes on the misguided populace, slaughtering them to the last man woman and child. Two weeks into the genocide, a Tau fleet appeared in-system. Quickly, the Astartes fleet moved to engage and destroy the enemy spacecraft. Half of the Tau fleet screened against the Imperials as the other half moved to deploy ground forces. The ground war was a short and bloody campaign, the Astral Leviathans moving quickly and scything down the xenos before they had a chance to deploy heavy armour or set up any forward bases of operations. The rapid and aggressive strikes forcing the tau into a defensive battle with no ground to stand on. Three months was all it took to cleanse the planet of all xenos and xenos supporters.