Walkthrough. All bonus objectives, intel.
Marcion's forces don't attack unless they're provoked, so we use this to our advantage.
We get Refineries next to the nearby Tiberium fields, and use Emissaries to get War Factories and vehicles up by the entrances to our section of the map.
We build a strike force made up of upgraded Scorpions, Raider Buggies and Beam Cannons and go destroy the Scanners.
We go for Marcion's bases and statues, letting the Beam Cannons handle most of the work for us in order to avoid sacrificing hundreds of Scorpions! Hey, it's one way to do it!
Marcion attempts to escape in a really slow vehicle, we destroy the escorting forces and take Marcion to our base, completing the mission.