Rescue from Fort Kastav

Information
This quest belongs to The Imperial Legion quest line.

Quick Walkthrough

 * 1) Talk to Tullius, go to the Imperial Camp of Winterhold and report to Rikke.
 * 2) As ordered, go to Fort Kastav and break in through the hidden hatch.
 * 3) Free the prisoners and wipe out the garrisoned Stormcloaks.

Detailed Walkthrough
Talk to Tullius and then, as ordered, go to the Imperial Camp in Winterhold and report to Rikke. She will tell you about some legionnaire prisoners held by the Stormcloaks at Fort Kastav. You are to join some soldiers led by Hadvar, sneak inside, free the prisoners and then wipe out the Stormcloaks.

When you get there, speak with Hadvar, who will tell you about a hatch hidden below the snow from where you can sneak inside. The hatch is located at the base of the southeast tower.

Go through the hatch, defeat all Stormcloaks that get in your way, and free the prisoners. Next, get out into the courtyard and kill the Stormcloaks waiting there.

After killing the Stormcloaks, talk to Hadvar who will tell you to report to Tullius. Do that and Tullius will award you with some new armor and promote you to the rank of Legate.