The map tries to follow the overall story of the books /A Song of Ice and Fire/ (by George R.R. Martin):
/Game of Thrones
Clash of Kings
Storm of Swords
Feast of Crows
Dance of Dragons
Winds of Winter
Dream of Spring/
= How it has happened and will happen (pretty much, probably, surely).
You will fight your way to victory in "the war of five kings" and unite Westeros to defend the Realm against the looming Darkness beyond the wall. This means dozens of huge battles with armies tens of thousands strong!
Just follow the visions in flames that will lead you to victory.
Eventually you either win or die, to the last man, there is no middle ground.