Siege of Haven

The Siege of Haven, was a major engagement during The Breach between the modern Inquisition and the Demon Army of the Elder One, revealed in this conflict to actually be the ancient darkspawn Corypheus.

Prelude to Battle
After the success of closing the Breach - either with the aid of the Mage or Templars - the Inquisition celebrated its victory at Haven.

Aftermath
The Inquisition not only lost a number of its forces from this battle, but lost Haven which had been serving as the modern order's base of operations.

However, despite the losses to the Inquisition, Corypheus also suffered several losses to his own army due to the Inquisitor causing an avalanche that buried thousands of demons in it's path.