Radia had arrived on the imperial colony planet through an ancient webway gate. A small base was fortified on the planet for recon next to it, cloaked by the energy of the gate. The base mostly consisted of rangers and a few troops and tanks to protect the base if it was found. If needed, messengers could be sent through the webway to call for reinforcments. This of course was the worst case scenerio, the Eldar had no interest in this imperial colony and were only there because of one of their nearby exodite worlds in the system.