Lieutenant Delsun has explained the fighting force of the gnolls within the Caves. She has asked for your help in the battle with them. She has asked that you kill a number of the gnollish soldiers and some of their minions.
Although the quest is listed as heroic it is possible to complete without killing any heroic mobs. When hunting Rockpaw guards, the only heroic creatures involved with the quest, a single solo spawn can be found wandering between the Rockpaw camp on the third level and the the stairs to the second level.