Speak with Captain Kroghan at Garadar in Nagrand.
<Still catching his breath, the messenger gestures for you to sit.>
They may not survive, [race]! Get to Garadar as quickly as your legs will carry you.
<In response to your blank stare, the messenger elaborates.>
The home of the Mag'har, lies to the south, in Nagrand. Take the southern road out of the marsh, then turn east at the first fork and look for a large settlement on the lake.
Find our commander, Captain Kroghan, there and offer him what assistance you can. Garadar must not fall!