You have to rescue Martellus and he is a Techmarine!! [more on that later.] You are have to defend the array, you get new turrets that can now be upgraded. [missile launchers]
However; you are up against Orks and Chaos Marines and the go for the generators that are not easy to keep protected.
There are two bosses that you have to take out. Ork Weirdboy - is not that hard, I used the whole squad, he went down. The Plague Champion was a bite in the butt, he has a little circle cloud thing that does Damage Over Time, so keep clear.
And... Martellus , after the mission is over. He fixed the Terminator Armor! [Sweet!!]
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