If you say you didn't have any trouble with that mission I have to be a little skeptical. The computer will repeatedly scud storm any forward defenses you put up and then rush what's left, you have to be ready to replace them immediately with backups. Yes you can spread your base out and build hackers, but by that time you will have been scud stormed several times and pretty soon the mobile scud launchers are at the edge of your base lobbing stuff in. This is all beatable, but I think most people will have to at least restart the game from previous saves to do it. Unless you stay under 5K.
well yea the first time i played the mission i failed but my forward defences everytime were always movable units and not gattling cannons or bunkers so when the scud comes i can just move my units, as for the scud launchers lobbing missles at me, thats what migs are for.
It took me a few attempts to figure this one out but I did it with a couple of MIGs to defend (take out scud launchers) and then I pumped out a shit load of dragon tanks and just had them throw up the fire wall. Then I sent a couple more MIGs to find the scud storm so i could nuke it.