The Jagged Crown (Stormcloak)

Information
This quest belongs to the Stormcloak questline.

Quick Walkthough

 * 1) You will receive this mission when taking the oath
 * 2) Head to Korvanjund
 * 3) Join the group and flank attack the Imperials, enter the temple
 * 4) Defeat the Draugr in the throne room and take the Jagged Crown
 * 5) Give the crown to Ulfric.

Detailed Walkthrough
When talking to Galmar Stone-Fist he will offer you a new quest, just continue talking to him and you will receive it.

Head to Korvanjund by fast travelling to a place nearby and then running from there. When you reach the group, where the quest mark is just approach. Galmar Stone-Fist will talk to you so just reply affirmatively and listen to his speech and attack the Imperials.

Once all the Imperials are killed follow the group up the stairs on the other side and yet again listen to the speech of Galmar Stone-Fist. Follow the group inside the cave.

Don’t rush once inside! Follow the group and wait for your command.

The tale of this story is to follow the group, if you do that this mission will be over naturally.

You will face a couple of soldiers in every room, just clear them and go forward.

In one of the rooms Galmar Stone-Fist will tell you to find another way in just walk up the stairs and you will find the way, take a shot at one of the Imperials and the group will join you.

At the end of the hall there's a sealed doorway, which can only be opened by an Ebony Claw, found on the ground. The code to the door can be found on the back of the claw: fox, moth, dragon.

Next, you will find a room with a barred gate. To open it you must find a lever. It can be found by following the path to your right (while facing the gate), and at the end of that path the lever sits on the wall to your left.

After opening the barred gate, your group will find a room with a draugr sitting in a throne. Kill him, and his two companions, and take the Jagged Crown from his head.

Deliver the crown to Ulfric Stormcloak.