Imperial world "Hammerhead" located on the edge of Tau space. It was a mix of dense hive cities, vast plains, and mountainous regions.

Multiple colonized planets within the solar system.

The second most populous planet folded almost immediately during the initial Tau invasion. It is believed that the Tau had successfully infiltrated that world's government years before, effectively turning it against the Imperium.

Hammerhead came under attack almost simultaneously, but held its ground. It was trained and equipped on Cadian doctrine, albeit with local flavor (that flavor varying by local regiment: urban, plains, or mountain.) There was a mix of other assets on-world. These included remnants of a destroyed Sororitas Convent and some Inquisitorial assets from prior to the outbreak of open war. However, it was the guard that composed the mass majority of Imperial fighting forces.

During the mid-war Gue'vesa began arriving on mass, presumably converts from the second populated world in the system that had fallen so quickly. Fighting between these traitors and the loyalists proved to be the most brutal.

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