Defeated Nod by selling their buildings.
I use an APC to explore, because it is tougher than the Hum-vees and find out, that it can drive straight into the Nod base before being destroyed.
I load the next APC with 2 engineers, capture Nod refinery. They destroy it and build a new one.
Another APC with 2 engineers. This time Nod refinery and Airstrip are captured. I order myself a light tank through the Airstrip, Nod destroy the Airstrip, the Refinery and the tank, they build new ones. At this point, they have 3 harvesters.
So I wise up to their rebuilding, send another APC, this time with 3 engineers. I capture their Construction Yard and 2 Tiberium Silos, then sell the silos, build myself a Refinery and then sell the construction yard. Next APC expedition captures their Refinery and remaining silos, selling it all.
Now, the Nod have no money and can only get more by selling their stuff. I hunt down their units, then send my grenadiers to destroy Nod guard towers.
But the Nod, rather than letting the towers be destroyed sell them and train rocketeers for the money. They also buy a light tank. This did not help them much though. I destroy their hand, then have engineers take their airstrip and powerplants, while grenadiers destroy other buildings and hum-vees destroy the harvesters.
Command&Conquer, GDI mission 5