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This is Part 11 of our complete Halo Wars Walkthrough, featuring Halo Wars Mission 11 Cleansing.
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Mission 11: Cleansing
- YouTube: Halo Wars Walkthrough - Cleansing Part 1 HD (Time: 5:01)
- This mission works a little differently than previous ones.
- Black Box Location: Only air units can reach this box. Take a hornet to the North-Western part of the ship. The black box is on the side of the ship and is very hard to see. You'll need to flip the camera around in order to find it.
- You don't start out with a full base. Instead, the mission takes place on top of the Spirit of Fire. You can train units from the nearby airlocks to create an army.
- There are two main objectives in this mission. First you must protect the airlocks. This is very important, since the airlocks are where you train units.
- The second objective is to clear all of the flood off the ship. You'll have to do this slowly.
- You start with a small army and a lot of supplies. Immediately kill the nearby flood units.
- Now take your army slightly South-West to a second set of airlocks. Kill the flood buildings here. This will be the flood's first target, so get it secure now.
- Your army should easily be able to destroy the nearby flood dens. The dens won't have enough time to train any units if you act quickly.
- Once the dens are down, it's time to create a few turrets.
- TIP: There are turret sockets all over the ship. You'll need to create turrets in areas you've secured. This way the flood can't regain a foothold on any part of the map.
- There are 4 turret sockets on this section of the ship. Create turrets on all of them. You should have enough money.
- YouTube: Halo Wars Walkthrough - Cleansing Part 2 HD (Time: 5:02)
- This section of the ship won't be attacked again for a while. You're turrets have plenty of time to finish building while you go elsewhere.
- Take your army back North-East to where you started. Another group of flood attack here. There aren't too many infected, so kill them.
- On this section of the ship is another 4 turret sockets. Go ahead and create turrets in all of them.
- Another group of flood will quickly attack the Southern section of the ship. Don't worry, your turrets can defend it by themselves.
- Now take your army North-East to the very tip of the ship. Here you'll find a flood den. Destroy the den and the nearby stalks.
- There are 2 turret sockets next to the flood den you just destroyed. Build turrets in both sockets.
- Optional Objective: Kill 100 Sentinels
- You'll see some sentinel robots flying around the map. To get the skull, you'll need to kill 100 over the course of the mission. Luckily, your turrets will destroy a lot of sentinels without you needing to attack them with your army. So just play the mission as normal.
- YouTube: Halo Wars Walkthrough - Cleansing Part 3 HD (Time: 5:01)
- Take your units slightly South and then East. This brings you to the bottom-right tip of the ship. Here is another flood den. It's exactly like the one you just destroyed. Blow up the den and then create turrets to defend the spot.
- TIP: You can upgrade any turret individually to specialize it's attack. Click on your turrets and upgrade them into either rail guns.
- Bring your army back South-West to the first section you cleared. Make sure that none of your towers or airlocks are damaged.
- TIP: If a part of the ship is getting heavily damaged, press D-Pad Up to see your commander powers. Select Heal and then click on the damaged building to restore its health.
- A special event happens after a little while. The sentinel robots declare your ship as a threat and send a cleansing ring.
- This energy ring can kill all of your units, but there is a way to avoid it.
- Take your army and have them enter the airlock. They are completely safe while inside.
- Wait until the cleansing ray has past. Then select the airlock and Eject your units.
- TIP: The ring only hurts units and buildings that are damaged. You'll probably need to rebuild some turrets after it hits.
- Rebuild any turrets that might have been destroyed. This is your first priority.
- Start training some hornets. These are the most useful units you can supplement your army with.
- TIP: A timer appears after the rings hits. This lets you know when the next ring is approaching. Watch it carefully!
- Attack the flood to the South of your base. You won't be able to destroy them before the next ring hits, but you can do some damage.
- Enter the flood base through the Northern-most path.
- There is a flood den here. Use grenades and regular attacks to take it down.
- Notice that there is a turret socket next to the den you destroyed. Create a turret to supplement your assault.
- When the timer hits 30 seconds left, retreat. Put your army into the nearby airlock to keep them safe when the ring hits.
- Keep training hornets. You should have plenty of supplies. Make sure you research their Wingman upgrade.
- After the second ring passes, rebuild your towers and eject your army.
- YouTube: Halo Wars Walkthrough - Cleansing Part 4 HD (Time: 5:36)
- Keep assaulting the flood base. This is a great time to attack since the ring has wiped out a portion of the flood army.
- Just attack the flood dens one at a time. Your army can easily defeat them.
- Another ring will hit soon. So put your ground units back into the airlock once you've defeated the flood to the South of your base.
- After the third ring, you'll get 2 vultures for free. These ships greatly increase your army's firepower.
- SECRET: Soon you'll hit 100 sentinels killed. When this happens, the Sugar Cookies Skull appears at the North-East end of the ship. Send a hornet over to pick it up.
- The last flood buildings are on the Northern side of your ship. They are just above your ship's center. Send both vultures over to destroy them.
- Now you'll just need to survive.
- Wait for each ring to hit. After a ring hits, rebuild turrets and defend. Your army should be big enough already. Besides, you'll need to spend all of your supplies on rebuilding turrets.
- Just make sure you replace any destroyed turrets and heal all airlocks. You don't want to lose any airlocks if you can help it.
- Some of the flood dens can regenerate. Go attack them again in-between rings. Eventually, they'll stop coming back.
- You win after all of the flood are destroyed. If you saved every airlock, you'll get the Battened Down the Hatches achievement.
- There is also a special achievement just for completing the mission. Achievement unlock: Ugly is only Skin Deep.