The Forth Blight

Fallen East and Burning West
The fourth Blight begins when the archdemon Andoral arises just as the Chantry's Exalted March against the Tevinter Imperium ends. This time, the darkspawn appear in great numbers in the northeast and northwestern regions of Thedas. As Antiva is overrun and its ruling family wiped out, the darkspawn pour into the Free Marches and Rivain. The Blight also rises in the Anderfels once again, the capital city of Hossberg coming under siege.

Fall of Ortan Thaig
Orlais and Tevinter are beset by decreasing numbers and manage to drive the darkspawn back into the Deep Roads; despite these successes they send next to no aid to their devastated neighbors. In the Deep Roads, the darkspawn capture the Ortan Thaig.[2]

Garahel's victory for the ultimate price
In 5:20 Exalted, the elven hero Garahel and his fellow Grey Wardens lead an army of Anders to Hossberg and break the siege. The Wardens then march to Starkhaven and form an alliance between the minor kings and teyrns of the Free Marches. Under the Grey Wardens' banner this united army marches north, eventually freeing Antiva at the Battle of Ayesleigh. It is here the Fourth Blight ends - and Garahel dies, having cast down and slain Andoral in single combat.

Aftermath
So many darkspawn are slaughtered in the Fourth Blight, it is easy for some to imagine that they will never return. This notion is compounded by a growing number of rulers telling their people that the darkspawn were forever defeated as a way to restore order. The next Blight is four centuries in the future, and the fact that dwarves must continue to repel darkspawn from their borders is increasingly ignored by surfacers (excluding the Grey Wardens).