Admiral Freyr is confident that what is left of his fleet, in particular his two battleships, will be able to blast a hole in the orbital defences large enough to allow your forces to be landed but is not so confidant about his ability to take out all of the orbital defences without suffering heavy enough losses to leave his fleet overly vulnerable to raiding by the surviving Dark Eldar ships. Due to this he will attempt to destroy the Dark Eldar Defence Stations and around a third of the Orbital Weapons platforms but will leave the reminder alone.