I believe this is a repost written by The Guardians of Vilya of the Skirmish Lieutenant Guide
This is a great read for anyone wondering what Skirmish Lieutenants do. Also if your looking to finish your deed on killing them, this will tell you what size skirm they appear in!
This guide won’t help a lot of players that have been doing skirms for years, but it will help some new players understand why they just got one shotted in a skirm 30 levels below their character. 😀