Against the Charr

Overview
Objectives
 * Search the Charr camp to the east for signs of the Vanguard captives.
 * OPTIONAL Find Ways to weaken the Charr garrison
 * OPTIONAL Intercept the Charr supply caravan. Use explosive charges to disable it.
 * OPTIONAL Destroy the watchtowers with explosive charges.
 * OPTIONAL Employ the siege devourers to fire explosive charges at the garrison.
 * Defeat Harvest Soulreign

Summary
 * 1) Complete any or all objectives.
 * 2) Kill all Charr in base.
 * 3) Kill Bosses. (Harvest Soulreign last if you want the other boss exp too, his death will start cinematic.)
 * 4) You will Free Pyre Fierceshot during cinematics.

Obtained from
 * Vanguard Helmet at Battlefield in Grothmar Wardowns

Follow-up
 * Warband of Brothers quest.

Reward
 * 2,500 XP