What is happening:
Although not clear in the quest text itself, the map points to area of Writhing Haunt. The Forsaken Outrider don't seem be present in this location (or are phased incorrectly).
What should happen:
The Forsaken Outrider should be present for player to kill. The only videos I could find are from a later patch where Thurman Grant was moved, so unsure if this is 100% representative.
https://www.youtube.com/watch?time_continue=3&v=QBkZ-8ldJ3c
Links: quest = https://www.wowhead.com/quest=27173/this-is-our-army npc target = https://www.wowhead.com/npc=45209/forsaken-outrider npc questgiver = https://www.wowhead.com/npc=45165/thurman-grant
What is happening: Although not clear in the quest text itself, the map points to area of Writhing Haunt. The Forsaken Outrider don't seem be present in this location (or are phased incorrectly).
What should happen: The Forsaken Outrider should be present for player to kill. The only videos I could find are from a later patch where Thurman Grant was moved, so unsure if this is 100% representative. https://www.youtube.com/watch?time_continue=3&v=QBkZ-8ldJ3c
EDIT: The NPC questgiver Thurman Grant may be causing the issue? He is in the wrong location for turn-in once GM forced completion https://www.wowhead.com/npc=45165/thurman-grant
Once completed, he is found back at Chillwind Camp, even though the map turn-in spot locates him in Writhing Haunt, as does the guide in Wowhead.