Tip 1: The scenarios are filled with lots of base assaults and very nested defenses. As soon as you get the chance, create an artillery group slaved to a sensor vehicle and use it to bombard static defenses. Have an antitank group close at hand to protect your artillery when the AI charges out to kill the artillery group.

Tip 2: Defending against assaults is the other big scenario challenge. When you establish your new base area at the beginning of each of the three campaigns, start building up defenses slowly around your main base, around oil wells, and at natural choke points. Build when you have the extra resources lying around and keep doing so, because you will need the added units eventually.

Tip 3: Learn how to use the dreaded clock timer to your advantage. Stop just short of the scenario victory condition and let your resources pile up as the clock runs down. You can also use the time to build up your forces and defenses. Just don't wait too long and blow the mission.