Damocles Gulf Crusade

By using the cunning infiltration tactics masterminded by the Ethereal Aun'Va, the T'au colonise a great many human worlds on the far side of the Damocles Gulf. The resultant counter-invasion sees a vast battle group of Space Marines and Imperial Guard scour the T'au colonists from the Damocles Gulf and penetrate deep into the heart of the T'au Empire. The war philosophy of the Imperial savages is brutal and wasteful in the extreme, but undeniably effective. O'Shovah is reassigned to Dal'yth where, fighting alongside his comrade-in-fire O'Shassera, he engages the Imperium in a series of bitterly contested wars. Just as the T'au are ready to encircle and exterminate the trespassers, the Ethereal Caste orders a truce, and the Imperium's armies are allowed to leave the T'au Empire unmolested. In the aftermath of the war, Aun'Va orders the Fire Caste heroes known as the Swords of Puretide to have their prototype Puretide engrams removed by lobotomy -- though Farsight shields his friend Commander Sha'vastos from this fate.