Nod has brainwashed Peasys Farmers into thinking that GDI is the enemy. Clear out the GDI Outposts and we will aid you with Engineers for a takeover. Proceed to eliminate the GDI scum!
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The farmers are more helpful then you might have thought.
It's supposed to be tricky, and I guess as with all campaign missions the difficulty comes when you have limited money. The fun accident with this mission was that you get access to both factions when you capture the GDI Construction Yard.
Campaign tech trees and units obviously (so GDI Weapons Factory has APC).
Keep an eye on your original starting position whenever you hear reinforcements have arrived.