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Defense of CASTLE Base is the second campaign level in the Halo Interactive Strategy Game.
This level takes place in CASTLE Base, on planet Reach, during a Covenant assault and the Covenant attempt to steal Earth's coordinates. It was said that this particular level was going to be part of a level in Halo Reach but was scrapped for some unknown reason.
- UNSC Forces: Eliminate all Covenant attackers in CASTLE Base.
- Covenant Forces: Enter CASTLE Base and steal the data packet containing Earth's coordinates.
Next Level: The Hidden Artifact of Reach