Another mission against the giant quadruped fortress and it's still not time to take it out, despite what HQ wants! Make sure you have a sniper rifle or rocket launcher to take out the UFO carriers in this mission, and back it up with whatever weapon you like to take out the ants and Gunships that will be attacking during the onslaught. A good shotgun will get the job done. To start, completely ignore your troops. They are ready to rush into combat and die a valorous death. Let the A.I. do that.

You instead, need to move to the left of the starting point until you are nearly at the western edge of the stage. From here, take down any of the enemies that are coming in and attack the first of the carriers. Attacking the carrier will make any enemies it has deployed come in at you, but you won't have to deal with the enemies that are under the other carrier.

At some point, the fortress will start firing its cannons and moving. Make sure you stay far away from it, moving north or south as needed to keep your distance. As long as you do so, the lasers will never come close enough to be any real threat, leaving you to simply take out the couple of UFO carriers and their attendant enemies. Let the fortress go its own way. Don't worry; you will have time enough to take it down next mission!