This is Part 12 of the complete Halo Wars Walkthrough, featuring Halo Wars Mission 12 Repairs.

1. Immediately you'll notice that this mission takes place on the same map as mission 11.
2. Black Box Location: The map for this mission is the same as Mission 11. And the black box is practically in the exact same place as the previous one. Take a hornet to the North-West end of the ship and rotate the camera to find it. Just remember you'll need an air unit to collect it.
3. You're defending again; however this time it is against the covenant army.
4. Immediately highlight your cyclopses and direct them to the damaged power core.
5. New Unit: Cyclops
6. The cyclops is a support unit. It can heal nearby buildings and vehicles, making it an excellent supplement to any army.
7. Have the rest of your army defeat the nearby covenant troops.
8. Optional Objective: Keep at Least One Deck Gun Alive
9. Don't worry about this optional objective. It doesn't give you anything.
10. This mission goes on until you've completely repaired the power core. There are two distinct approaches this mission.
11. The first way is very easy and will get you a hidden achievement. But you won't be able to get the skull. The second strategy does get you the skull, but it takes longer and voids the hidden achievement.
12. TIP: This mission is extremely short. Just replay it if you want both the skull and hidden achievement.
13. Strategy 1
14. This is the fast way through the mission. Follow this strategy and you'll also get that secret achievement.
15. Remember that all you need to do is repair the power core. So this strategy involves training an army of cyclopses.
16. Send all of the cyclopses you start with straight to the power core.
    • YouTube: Halo Wars Walkthrough - Repairs Part 1 HD (Time: 5:02)
17. Now start training cyclopses at both of the infantry air locks.
18. Press D-Pad Up to bring up the commander powers. Here you can set a Global Rally Point. Set the rally point next to the power core. Now any unit you train will immediately go there first.
19. Keep training cyclopses. You should get at least 15-20.
20. The army you start with is enough to defend the cyclops group as they do repairs. Just keep them nearby.
21. Have all 3 of your spartans take over a friendly vehicle. Make sure that two of your spartans are in hawks. This greatly increases their firepower.
22. It won't take very long at all for you to repair the power core. Massing an army of cyclopses makes this mission very easy.
23. If you're constantly training cyclopses and sending them to the core, you'll have the repairs done within 4 minutes. This gets you the achievement: Handy With Tools.
24. The mission ends as soon as the core is repaired.
25. Strategy 2
26. This strategy is slower, but will get you the skull.
27. Purposely don't build any more cyclopses. You'll want to repair the ship slowly so that you can fight.
28. Have all 3 of your spartans take over hawks. You start with two, so train a third hawk for the last spartan. This greatly increases their firepower.
29. Optional Objective: Kill 12 Spirit Transports
30. This is the objective that leads to the skull. It won't be that hard to get though.
31. Start training hawks. These air units will massacre the covenant forces.
32. Defend while you train hawks. It shouldn't take very long until you've reach the population max.
33. The covenant come in waves. Meaning that once you kill all of their troops, spirit transports will fly in and drop off more.
    • YouTube: Halo Wars Walkthrough - Repairs Part 2 HD (Time: 5:57)
34. Kill all of the covenant. This will trigger the spirit transports to come.
35. Your hawks are excellent anti-air units. They'll destroy the transports easily. Just fly around and kill them as they drop of infantry.
36. You need to kill 12 transports. You won't do it in this wave though. Also, it's not possible to kill all of the transports that come by.
37. Now kill all of the infantry units that got dropped. This will cause more transports to come.
38. It won't take long at all to kill 12 transports. Your hawks are simply too powerful for any of the units that the covenant throw at you.
39. Once you've killed your 12th transport, the Boomstick Skull appears at the North-Eastern part of the ship. Send any hawk over to collect it.
40. Now just defend the power core. It doesn't matter if the rest of the ship gets destroyed.
41. Train as many cyclopses as you can. You won't be able to make many though, since your hawks take up most of your population.
42. Eventually your cyclopses will finish repairing the core. It will take a while, but you'll win.
43. The mission ends as soon as the power core is fully repaired.

Halo Wars Walkthrough

• Tutorial
• Mission 1: Alpha Base
• Mission 2: Relic Approach
• Mission 3: Relic Interior
• Mission 4: Arcadia City
• Mission 5: Arcadia Outskirts
• Mission 6: Dome of Light
• Mission 7: Scarab
• Mission 8: Ander's Signal
• Mission 9: The Flood
• Mission 10: Shield World
• Mission 11: Cleansing
• Mission 12: Repairs
• Mission 13: Beachhead
• Mission 14: Reactor
• Mission 15: Escape