The Fennerheim IV-2 incident

The Tau Empire reaches out

M40.160.612 - Tau forces discovered in the Fennerheim system as Mechanicum forces locate tech artifacts

Mechanicum digging expedition finds itself under siege from Tau forces

Mechanicum forces were deployed on the ringworld of Fennerheim IV-2 to search for supposed tech arcana in the rocky sand dunes when a surprise attack from hidden Tau forces caught them off guard.

Kroot forces charge the imperial lines with fire support from their Tau brethren

Castellan maniple charges through the ruins of Fennerheim IV-2

Thankfully, the expedition forces were joined by a cohort of Castellan robots intented to drill free passages, which came in handy when the Mechanicum forces discovered they are with company on the planet's surface.

Tau fire warriors fire overwatch into the charging Mechanicum walker construct

 After a fierce and bloody battle, the Imperium forces stood victorious over the northen continents big dust basin to secure the exploration site.

Tau air cadre try to support their deflected brethren on the ground