Total Annihilation/The Fortress Falls

Mission Briefing
Intell-tap Arm is well fortified behind the foothills to the north. They are becoming foolishly desperate. Their irrational love of their homeworld may yet work in our favor. If Core can destroy the fortress here, Arm will fail.

Destroy all Arm vermin.

DO SO NOW

Details
Starting units: Commander, 2 Finks, 3 Pyros

If you want to take on this mission in one sitting, it's time to grab some snacks and drinks and make sure your chair is comfortable. Save often and get settled in, because Arm already owns most of the map when the Core Commander arrives.

Immediately ground the Finks and build resource collectors. Start building a KBot Lab, Vehicle Plant, and Aircraft Plant in the southwest corner of the map. Get radar up as the first units start to flow out of your structures. When your units start coming along, you might want to consider setting the unit orders on anything with long-range weapons to something other than fire at will, since that might bring more Arm units down on your base than you're ready to deal with.

Build Crashers and Slashers for air defense, and a Construction Vehicle (or KBot) to build Pulverizers and Gaat Guns. Build up through the tech tree to get more advanced units and structures. When the Core forces finally include a good number of Diplomats, Reapers, Cans, Pyros, and AKs, along with air support in the form of Rapiers and Vamps, move forward to within sight of the western pass. Keep the Diplomats in the back with an Informer and keep them targeted on the Arm units and defenses.

Don't push forward into the pass or the hills, just sit and deal with the counter-attacks from Arm. Target the defensive structures along the hills when not dealing with enemy attacks (for the most part the Diplomats can handle this on their own, just keep feeding them targets). Keep reinforcements moving into the lines to prevent the Core line from being overrun.

When the Arm defenses are down, and the attacks slow, move forward to take the hills (this could be a couple hours into the mission, the whole process is a very slow advance). Construction Vehicles should search the southern portion of the map for metal deposits, building Moho Mines and Fusion Reactors as they find them. Continue supplying the front lines with new units. Build defensive structures along the hills to replace the Arm structures you destroyed earlier. Hold the hills for a while and pick off any Arm units and structures in range.

Arm even managed to bring a battleship in for the fight, up in the top-left corner of the map. Slog through the battle, taking advantage of any chance to rest and build up resources and units before advancing further. Eventually it becomes a matter of whether or not you can bring enough fire power up to advance without over-extending the lines. Eventually one side will fall, and with patience it will be the Core left standing.