It appears that the forgotten warriors laying siege to the city had a number of legions sent up the largest hill in order to drive a wedge between two generals of the defending army. When this reporter questioned why such a maneuver would be used, a senior researcher (who asked not to be identified) shrugged and suggested that "perhaps that's just the way these ancient tacticians went about things."
He then went on to describe how a second (yet equally sizeable force) was used in a highly irregular fashion by hiding amongst the scattered buildings and using various types of ranged weaponry to slowly wear the enemy's commander down. It's unclear why the Orgrimmarian general didn't deal with the insurgents via the time honored tradition of "killing the ones in dresses" first, but according to historical reports he definitely spent the majority of the battle tracking a single well-armored invader through the city while ignoring the obvious threat.
One odd detail that the Center for Orgrimmarian Antiquity was hesitant to release is that the invading army had a particular dislike for the native dogs. Of course, this explains the curious mass graves that were found earlier this year and makes one wonder whether the majority of members in the early civilization known as the Alliance hated animals as much as these brutal records suggest.
Also of note: amongst the cache was found an emblem reading "CQG." The significance of the letters remains a topic of debate.