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Heavenly Sword Walkthrough Ch 1 - The Art of Battle
Nariko needs to defend the fort. First, you need to reach the ground floor so you can protect your allies.
To get to the ground floor you need to climb up one ladder and then climb down two more ladders.
Once you reach the ground floor it is a simple matter of pummeling enemies until they quit coming.
You will have a small break and a small speech, then once again you will be rushed with enemies. Simply kill them all to get to the next part of the story.