This is what the quest says below.
Imperial Scout Burris believes there must be additional fragments of the Battle Orders you recovered. He wants you to prey on the Kwellen patrols near the Blood Swamp and procure additional fragments of the orders if you can.
Loot Fragments of Battle-Orders from the Kwellen in the Staging Grounds
There is no Blood Swamp so that's confusing. Maybe they are referring to the Spiritist Swamp?
There are no regular Kwellens there either only Berzerker Kwellens and after killing those for an hour and nothing decided to try regular ones. These are located in Easter Deadlands and still trying to figure out this blood swamp thing. This quest should be looked at and corrected. It's very confusing.
-Kor