The Chief of Thirsk Hall

Walkthrough
Should the Dragonborn not yet have assaulted the Thirsk Mead Hall during Retaking Thirsk, the Rieklings who have taken over the hall will be friendly. And their Riekling Chief will ask the Dragonborn for help with a few matters.

Give Bilgemuck some meat
The first task is to return Bilgemuck to its pen on the southern side of the Thirsk Mead Hall. For this locate the special bristleback near the lake, just north of the hall, and lure it back with some meat. Pretty much any meat will do.

Return Bilgemuck to Thirsk
Bilgemuck will then follow the Dragonborn right into the pen.

Talk to the Chief
Tell the chief of the success.

Bring 10 Scathecraw to the Chief
This time the chief requires ten Scathecraw that can be found all over Solstheim. Collect them and give them to the chief.

Having witnessed the Dragonborn's skills he asks for the support of his clan of Rieklings against the "bad" Nords from Bujold's Retreat.

Note: Should the Dragonborn have explored and talked to Bujold the Unworthy at Bujold's Retreat, then it would be clear that the Riekling's actually took the hall.

Also note: Supporting the Rieklings against the Nords obviously forfeits Retaking Thirsk, and several personal quests the Nords would have had.

Join the assault
Tell the chief you will support his Rieklings against the Nords.

Kill the Nords
Wipe out the camp of Nords at Bujold's Retreat.

Speak to the Chief
After defeating the Nords, not all is well though, since the jealous Riekling Chief sees the Dragonborn as a threat to his power and attacks.

Defeat the Chief
Since the other Rieklings witnessed the Dragonborn's prowess, they start to attack their "former" chief once he attacks, seeing him as an unworthy leader apparently.

Der Häuptling der Methalle