From the introduction:
Time moves on, as time is wont to do. The fallout from the invasion is cleared, as best it can be. Skirmishes with stragglers are common at first, but soon begin to grow fewer and fewer. Ruined buildings are rebuilt, and people settle down once more.
Peace at last spreads across the world. Across your world.
After so long fighting, so many adventures in so many places, that peace is strangely seductive.