This quest is not available in game.
Speak with the Fallen Hero of the Horde at the border of the Blasted Lands and the swamp.
We fight the wrong enemy, <name>.
The true power in these lands continues to grow in strength and number while we squabble over scorched earth with orcs.
Do we continue to fight a war in these lands against the Horde, only to be routed one day by the armies of the Burning Legion? It is futile.
Put your differences aside, <name>, speak with the fallen hero of the Horde. He knows the truth behind the Blasted Lands.