Save the Colonists! - Starcraft 2 - Wings of Liberty - Haven's Fall - Brutal playthrough
Raynor has chosen to wipe out the Zerg infestation in place of the Protoss, choosing to take the safe route and preventing the threat of infestation from spreading any further.
Strategy:
You start off this mission at the 9 o'clock position on the map, with some SCVs, 3 Vikings, 2 Firebats, and 4 Marines. Your primary unit composition during this mission should be Marine/Medic, with some Marauders and Vikings as support. You don't need any more than 6 Vikings at most. You'll want to focus on attack upgrades for your infantry and Vikings.
As the mission starts, start building another Viking and send your first 3 Vikings to the closest infested base. There's no anti-air there, so first take out all the Brood Lords, then proceed to land your Vikings and destroy the base. Your 3 Vikings, soon to become 4, should be able to easily take out any resistance that they meet with. Be careful when destroying the buildings though, as they'll spawn Broodlings when destroyed, so you might want to change your Vikings into air units to avoid them. Once that base is destroyed, the attacks against your main base should cease for now.
Once that base falls, you want to build up your economy and wait a while. Soon, you'll get a message that the colonists to the south of your base are being infected. You're going to want to save them immediately, as once the Virophage finishes, you'll have to deal with a stream of infested units converging on your base. Ensure that you keep some defense force at home, as at points during the mission, the Zerg will be attacking your main base.
Move down with your infantry ball and Vikings, and use your Vikings to perform hit and run attacks on the Brood Lords. Don't charge in with your infantry yet. Whenever you see Mutalisks start to move toward your Vikings, you should run them back to your Infantry ball, as Vikings aren't too effective against Mutalisks. Once you've cleared out half of the Brood Lords, you can then charge in with your Infantry ball, as your Medics should easily heal any damage done to your Marines.
From this point on, whenever you see a colony getting infested, you want to rush to save them, as you don't want to deal with any additional flood of units. After you get around a 24 unit infantry ball, you should combine those with your Viking force, and use that to primarily hunt down infested colonies. You should then build up another 24 unit infantry ball, and use that to destroy the primary Zerg bases. If you've been keeping up with your upgrades, no Zerg base should pose a problem. Be careful at the northern one though, as there is an Ultralisk there that will rip through your Marines if you're not careful. Just spread out your units and focus fire it down.
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