Key number 1 is a good defensive setup from Mission #2 (you have the exact end game from that mission). This will give you a little time to breathe. There are three major choke points through which the enemy can come to get you. You should be able to block one of them relatively quickly, and work towards the other two.

In order to block the central passage, if you build a silo up against the corner of the ridge wall, you can then build turrets on the top of the ridge and build additional camo pillboxes up there. As long as you keep repairing them, they should be able to hold that pass. The lower 'choke point' is at the bottom of the map. The best thing to get there in a hurry are a couple light tanks and enough infantry to defend the spot (you can make sure you have tons of infantry from mission 2). Make tons of rocket guys. Those can take out YAKs if they're in groups of 3 or more. Put little groups of these guys in guard around things the YAKs like to harrass.

You want to build silos and/or power plants from your base down towards that lower choke point until you're at the point that you can build a few turrets and pill boxes there, to help defend it. Once you've defended that spot, then 2/3rds of the board is yours. Alternately, you could start building a turret, send the MCV down towards the corner, and once you open it up immediately build the turret next to it (and have some rocket guys there too).

So the top point is left to defend. This is more difficult to blockade well because it's very close to the enemy base. Basically work your way over to it, or build up a fleet of 12 or so tanks plus tons of infantry, and while protecting the other two passes with the turrets and such, send the forces through. Get to the flame towers first, and then overrun the rest.

Red Alert Walkthough Index