Spy!

Background
During your preparations for The Attack at Nightfall, you can recruit Berwick. An elf in the tavern, is a spy sent by Loghain to keep an eye on Redcliffe Castle.

Walkthrough

 * Talk to Bella or Lloyd to learn Berwick's name.
 * Pickpoket Berwick for the letter. If you have enough coercion you can talk him into defending the village.
 * Call Berwick by his name.
 * Ask about the letter you pickpocketed.
 * Ask him to defend the village

Result
Adds another solider to defend the village.