Glaumunt wants you to spy on the Imperial soldiers to learn how to do a proper Imperial salute.
This quest is available if you have completed the quest Getting Even with Garlemald, and have reached level 46.
Starting the Quest
Talk to Glaumunt in Revenant's Toll in Mor Dhona to begin the quest.
Lie in Wait at the Specified Location
Go southwest and leave Revenant's Toll via the southwest gate. Go to where the orange arrow is pointing in the minimap. You will find a purple circle around the destination. Step into it and defeat the two Decurions that attack. Then examine the sparkling Destination. There will be a cutscene.
Report to Glaumunt
Go back to Revenant's Toll and talk to Glaumunt to complete the quest.
Next Main Scenario Quest
After you complete the quest, talk to Cid to accept the quest Drowning Out the Voices if you haven't already. If you have already completed it, talk to Sark Malark to accept the next quest: Dressed for Conquest.