Genestealer uprising in the Deeps

In 12.019M42 the Alliance suffered dual reverses. At the same time as the system of Hussaria was re-invaded by the Imperium, a massive genestealer uprising on Lucardium in the Perseus Deeps suddenly rocked the Tau Empire. Sensing weakness, the genestealer cults had been planning their overthrow of the tau for many months, but the eldar hoped to head them off.

Having received visions of imminent xenos action, the eldar farseers drew up their forces, intercepting the cults before they had chance to assault the unsuspecting tau. However, the cult was stronger and better equipped than the eldar had anticipated, and the eldar ambush was shrugged off. The Genestealers then went on to attack and take several outlying tau settlements, routing one tau army as they moved ever inward to the central city and spaceport on the small tau colony. The cult of the four wheeled emperor had now been detected on Lucardium, Morecai and at least two other worlds in the Perseus Deeps, and a general uprising was now expected.