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This is Part 9 of our complete Halo Wars Walkthrough, featuring Halo Wars Mission 9 The Flood.
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Mission 9: The Flood
- YouTube: Halo Wars Walkthrough - The Flood Part 1 HD (Time: 5:05)
- At the start of the mission you must save a group of spartans from the flood.
- Black Box Location: From your base, go North along the West side of the map. The black box is just West of the big flood colony. Use a hornet if you are having trouble finding it.
- Immediately build 2 supply pads.
- Next build a reactor.
- Once your reactor is done, upgrade both of your supply pads into heavy supply pads.
- Build another reactor.
- When the second reactor is done, immediately build a vehicle depot. It's time for some scorpions.
- Upgrade your main base into a fortress.
- TIP: You won't need a barracks in this level. You start with 2 elephants, so you can train marines from there.
- YouTube: Halo Wars Walkthrough - The Flood Part 2 HD (Time: 5:04)
- Build turrets in all 4 potential spots around your base. You'll need some defense before venturing out against the infected.
- Once your fortress is finished, you'll have 2 final building spots. Create an armory and another supply pad.
- Start training scorpions. Infantry get defeated and infected easily by the flood, so it's better to stick with vehicles.
- Train 4 more scorpions. When you have 5 total scorpions, it's time to roll out.
- Take your army slightly North. There are some pods here. Blow them up to find a few supply crates.
- Save up supplies until you have 1200. Then upgrade one your reactors so that you have a power level of 3.
- The power level upgrade doesn't take very long. As soon as you have 3 power, click on your vehicle depot and research the cannon upgrade for you scorpions.
- As your army goes North, you'll run into a Flood Stalk. Destroy it to trigger an optional objective.
- Optional Objective: Kill 20 Flood Stalks
- This objective leads to the skull, so it's worth doing. There are actually plenty of flood stalks here. But first you need to clear out the enemies.
- Go North East to find a flood launcher. This is basically a tower. Concentrate your scorpions on killing it first.
- YouTube: Halo Wars Walkthrough - The Flood Part 3 HD (Time: 5:04)
- Once the launcher is down, your tanks can easily kill the surrounding infected.
- Keep training scorpions. You can never have too many. Make sure you're always creating a steady stream of them.
- Clear out the remaining flood buildings. They produce more units, so get rid of them quickly.
- You're going to hit the population limit soon. At your armory, research reinforcements to upgrade the population limit.
- To the North-West is a giant flood building. This is a colony. Shoot and destroy it. This weakens the nearby infected. Just keep in mind that the colony regenerates eventually.
- Optional Objective: Have all 5 Flood Colonies Dormant at Once
- This is an optional objective that makes the mission much easier. You also get a hidden achievement for it. The other 4 colonies are automatically marked on your minimap with huge red dots.
- Kill the flood stalks around the colony you just destroyed. There are 16 total surrounding it. This leaves just 4 left to complete the optional objective.
- Travel slightly North to find the spartans. They join your army as soon as they're in your sight.
- You have a new objective now. A huge Flood Boss appears to the North. Don't fight it just yet though, it's better to complete the optional objectives first.
- There are some more flood stalks here. Kill them to bring your total to 19. You just need 1 more.
- TIP: Consider having your spartans hitch a ride in your scorpions. Highlight a spartan and then target your own vehicle with Y. Not only does this keep your spartan safe inside the tank, but the scorpion receives a big stat boost!
- Now go South-East to find another flood colony. Easily kill it. There is hardly any enemies here.
- South of this colony is another group of flood stalks. Kill them to complete the optional objective.
- SECRET: When you kill your 20th flood stalk, the Rebel Leader Skull appears on a ridge just North-East of your base. You'll see it on the ridge when you come close, open your leader powers and then use a pelican to transport a spartan onto the ridge to get it.
- Now you'll want to destroy all of the colonies at once. If you went for the skull, the first colonies you attacked will have regenerated by now.
- There is a flood colony right next to the skull. Go ahead and defeat it.
- TIP: Each destroyed colony weakens the boss.
- The easiest thing to do is to split your army into 2 groups. Have one group on the East side of the map and the other on the West.
- Take one group to the first flood colony you fought on the Western side of the map. Defeat it again.
- Meanwhile have your other group defeat the second colony slightly North of your base. It should also have regenerated by now.
- YouTube: Halo Wars Walkthrough - The Flood Part 4 HD (Time: 5:04)
- TIP: Use D-Pad Down to quickly cycle between your two groups. Then use RB to highlight all local units. This is a good way to keep your separated groups from accidentally coming back together.
- Only two flood colonies left. Be quick so that the colonies you already destroyed don't regenerate.
- The last two colonies are to the right and left of the boss. Take one group to each.
- Just run your units straight to the colonies and destroy them. Ignore the nearby infected.
- Destroy the last two colonies. use canister shells to take them out quickly.
- NOTE: If you have all 5 colonies killed before one regenerates, you unlock Achievement: Sweet Naptime. Don't worry that it doesn't pop up right away, the achievement appears after you've beaten the boss. Also, you'll still get the achievement even if the colonies regenerate later.
- With the colonies down, it's time to beat the boss.
- The boss is a Gravemind. This thing controls all the nearby infected.
- Kill the towers and tentacles around the gravemind. You'll start losing scorpions, but that's okay. You can train more, but the mission will probably end before they can make it to the battle.
- Once the towers in front of the gravemind are down, concentrate on the boss himself. Hit him with your canister shells and regular attacks.
- There are lots of flood units around here, just ignore them. All you have to do is defeat the boss to finish the mission.
- With all 5 colonies gone, the gravemind's defenses are extremely low. You might have a colony regenerate during the fight, but it won't be enough to save the boss.
- Just keep focus firing on the boss until he goes down. You will lose a few tanks, but the rest of your army will easily dispatch of it.
- The mission is complete once the gravemind dies.
- YouTube: Halo Wars Walkthrough - The Flood Part 5 HD (Time: 6:27)