Demands of the Qun is triggered after speaking to Iron Bull in Skyhold. It's unknown exactly what condition this quest becomes available, but it's likely due to a combination of time (i.e., other quests completed) and positive disposition of Iron Bull.
Head to the Storm Coast, and be sure Iron Bull is in the party. A cut scene will occur regardless of which camp you travel to, and you'll be brought to the relative location automatically. You'll be briefed on the situation, and Bull will break off to brief his Chargers. Speak to Bull when you're ready to begin the assault.
After the Chargers clear out, head down the dirt path they were blocking off. The road seems like it goes away from the target, but it'll curve back right after a while. Bull and Gatt will start chatting as you make the turn, so you'll know you're going the right way.
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You'll have a couple minor skirmishes before you get to the target, which is a small camp guarded by several Venatori. Wipe them out, then interact with the bonfire to light a signal for the fleet.
A cut scene occurs, and you will need to make a choice when the Chargers start to have difficulty. If you advise Bull to call a retreat, he'll be gracious and the Chargers will live, but the inquisition will lose out on many resources they could have had from the alliance. If you advise Bull to let the Chargers fight, they won't survive, and Bull will be severely unhappy, but the inquisition will prosper. Note that if you are planning on romancing Iron Bull, it's greatly advised that you allow the Chargers to live. However, allowing them to fall will not jeoparidze a relationship; it just may take a little longer.
Once the decision is made, you'll debrief at Skyhold. No matter how it turns out, the quest will resolve.
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