Bastok and Windurst have both pledged reinforcements for Jeuno. Make all haste and deliver Count Borel's letter to the duchy before the unthinkable comes to pass.
With the Key Item: Count Borel's letter, go to Sauromugue Champaign (S) and check the Bulwark Gate at (F-6) to trigger a cut scene. When the cut scene is over, you will get Key Item: Underpass Hatch Key.
To read the transcripts for this quest, see the Borne by the Wind Spoilers page.
This mission is part of the Wings of the Goddess mission series. Check the Wings of the Goddess Mission and Quest Progression page for details. Other missions in the series include: