You return to Camp Dragonhead to meet with Lord Aymeric after questioning the knights at the gate.
This quest is available if you have completed the quest Defenders for Ishgard.
Starting the Quest
Talk to Alphinaud in Coerthas Central Highlands to begin the quest.
Speak with Haurchefant
Go east to where the orange arrow is pointing in the minimap. Go into the building and talk to Haurchefant to proceed.
Speak with Aymeric
Go outside and go clockwise around the building to reach the quest icon in the map. Talk to the House Fortemps Guard and say Yes to enter the intercessory. Talk to Aymeric to proceed. There will be a cutscene. This one is important, so it is recommended to watch it either now or via the Unending Journey in an inn room.
Speak with Alphinaud
Talk to Alphinaud to complete the quest.
Next Main Scenario Quest
After you complete the quest, talk to Alphinaud to accept the next quest: Committed to the Cause.