|First, you must wall your city off. Build artillery to protect the walls. Observation balloons keep your range up.
I use what I call forward fire bases. This is artillery, snipers, anti-tank guns, medics, and anti-aircraft guns. You will need at least three of each.
Extend the range on all of them to the max.
Move this group to a spot on the map. The snipers give you range on your artillery. The mobile anti-aircraft guns are critical, you need at least three but 4 is better. This group will control an area with a range of about 14. Once clear, laydown some towers and anti-aircraft (stationary) and move to the next area.
Unless you are presented with a large force, you are unstopable.
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