A Skirmish Captain sells some Traits that can be upgraded and they must be equipped with a Skirmish Captain or a Skirmish Bard. Additional skills are available only from the Skirmish Captain, he will give instructions to read to learn these (one is learned from reading the instructions reward from the quest Skirmishes); then, they can be slotted and upgraded with the Skirmish Trainer.
-  Skirmishes -- Reporting In
-  Skirmishes
-  Tutorial: Thievery and Mischief
-  Tutorial: Defence of The Prancing Pony