Zu finden in den Kommentaren bei
http://de.wowhead.com/?quest=12325.
Für eine deutsche Übersetzung einfach die Links anklicken und dann auf deutsch umschalten. Leider gibt es in der deutschen Datenbank keine Kommentare.
To get this quest you must complete the following:
First quest chain
1. The Lost Courier (optional)
2. Of Traitors and Treason
3. High Commander Halford Wyrmbane
4. Naxxramas and the Fall of Wintergarde
5. Flight of the Wintergarde Defender
6. Return to the High Commander
7. Rescue from Town Square
8. Find Durkon!
9. The Noble's Crypt
There you find a book which leads to next chain.
1. Secrets of the Scourge
2. Mystery of the Tome
3. Understanding the Language of Death
Last quest:
1. A Righteous Sermon
Second quest chain
First sub-chain (one must complete Flight of the Wintergarde Defender first)
1. The Demo-gnome
2. The Search for Slinkin
3. Leave Nothing to Chance
Second sub-chain (one must complete Flight of the Wintergarde Defender first)
1. The Bleeding Ore
After these are complete, a new quest becomes available:
1. Understanding the Scourge War Machine
With all these quests done, Into Hostile Territory finaly unlocks.
Hinein ins Feindgebiet 
