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The T'au discovered Gravalax in 837.M41 and initiated diplomatic contact with the planet's government.[1a] By 931.M41, the T'au Empire had established a trading mission on the planet, were making overtures to the Governor, and had become highly popular among the planet's citizenry.[1b]
Although Gravalax itself was of no strategic value, the Imperium refused to allow the Tau to make any further inroads into Imperial territory. On the other hand, the Imperium was painfully aware that provoking open war with the Tau would waste military resources that were desperately needed in other theatres. In response, a number of Imperial Guard Regiments under the command of Lord General Zyvan[1e] were ordered to garrison Gravalax in an attempt to dissuade the t'au.[1b] This led to what became known as the Gravalax Incident.
- 1: For the Emperor (Novel) — Ciaphas Cain: Hero of the Imperium (Omnibus)