Available after Fornstrand. You also have to complete quest The Silver Falcons: Part Two and become more intimate with Caedmon by talking to him three times when he has a (…) talk bubble to unlock his Bonus Stats.
The details and rewards for this quest change after the Six Bases appear on the map, so it's better to do it before then (see below).
Quest Details
This time you have to take out some soldiers of the Conqueror at the Harphlus Pass.
Spoiler warning: This section may contain information that could spoil the story line or displays in depth quest or fight details.
Like the other two it is just a big boss battle with reinforcements, this time in a more interesting way.
Initial: 3 Conqueror Army Soldier unions
Wave 2 (reinforces after terminating the initial wave): 6 Conqueror Army Soldier unions
Wave 3 (reinforces after terminating 2 more unions since the initial wave): 3 Conqueror Army Soldier unions
Wave 4 (reinforces after terminating 5 more unions since the initial wave): Roeas and Castanea (before unlocking the Six Bases) or 1 Conqueror Army Soldier union (after unlocking the Six Bases)
Reward
30,000g (if done before the Bases appear, otherwise 15,000g)
Spoiler warning: This section may contain information that could spoil the story line or displays in depth quest or fight details.
Speak with Caedmon in the Balterossa Pub:
Caedmon: Soldiers of the Conqueror's army were spotted near Undelwalt. I know not their intentions, but they must be dealt with without delay. You of all people should understand. The silver Falcons will engage the Conqueror's army at Harphlus Pass. I hope you will accompany us.
Rush: Don't gotta ask me twice!
Caedmon: I.m heading to Harphlus Pass now. Are you prepared?
Rush: Yup!
Caedmon: Glory to the Falcons!
or:
Rush: I need two secs...
Caedmon: If you have other pending matters, so be it. There is a chance the situation may change if we leave it for now.
or:
Rush: Let's leave them alone.
Caedmon: This group is the cause of the world's current chaos. These beings are sentient... They are more of a threat then any Jhana could ever be.
After the battle
Caedmon: The Falcons know only the meaning of victory. However, today's results are in large part due to your help. Take this. From now on, the Falcons will no longer request your assistance... It feels odd, being so truly indebted to someone. The Silver Falcons fight for justice regardless of whose land are we on. We have made enemies of several Lords, but we do not fight for their recognition. However, you have been a strong and true ally, and I promise to repay that debt. We shall fight with you. whatever the reason. Go to the guild facing Elysion's Assembly Hall if you ever have need of our assistance.
Quest Log
Spoiler warning: This section may contain information that could spoil the story line or displays in depth quest or fight details.
Getting rid of the rest of the Conqueror's army was satisfying! The Silver Falcons rock! Oh, and they help maintain peace in the world.