Campaign of Cleansing
The Campaign of Cleansing was fought between 606 and 792.M38 by the Tau Empire. Taking place during the First Sphere of Expansion, it was the first prolonged campaign by the Tau against the Orks, who refused to join the Empire or submit to any deal offered by the Water Caste. Initially, the Tau suffered many defeats but were ultimately able to eradicate the Greenskins thanks to the refinement of the Pulse Rifle. Shortly after the campaign, the Sept of Dal'yth was founded.