Though they can barely be said to control Stromgarde, let alone the whole of Arathi Highlands, the human prince trots the remnants of his cavalry over the countryside. I can't understand why he does it, but who understands the way the humans think, hm?
Whatever his reasoning, more importantly, he has given one of the sigils to Lieutenant Valorcall, their cavalry leader. Locate him and bring his sigil back to me.
Losing their cavalry leader will prove a large blow to the Stromgarde defenders. Better yet, it means that we are only one sigil from being able to have Trol'kalar for ourselves.