Talk to Legate Rikke for this quest. She will send you to clear out bandits from Hraggstad. Make your way up the mountain to the fort. You will have to clear out all of the Bandits from the courtyard, the Prison and the barracks to finish. When you've cleared out most of them, you will get waypoints to the last few. After you clear the fort, return to Rikke to finish the quest and join the Imperials.
Unbound Before the Storm Bleak Falls Barrow Dragon Rising The Way of the Voice The Horn of Jurgen Windcaller A Blade in the Dark Diplomatic Immunity A Cornered Rat Alduin's Wall The Throat of the World Elder Knowledge Alduin's Bane Season Unending Fallen The World Eater's Eyrie Sovngarde Dragonslayer
Loss of Innocence With Friends Like These Destroy the Dark Brotherhood! Sanctuary Mourning Never Comes Whispers in the Dark Silence Has Been Broken Bound Until Death Breaching Security The Cure for Madness Recipe for Disaster To Kill an Emperor Death Incarnate Hail Sithis!