Turrok, a changling caught up in the lunacy of the former leader's desire for land and power, was conscripted into the changling army and sent to Canterlot. But he denied the ideas of his leader. Being a nonviolent creature, he escaped before reaching the city. After the attack failed, a bounty was put out on him. A fork now stands in the road for him, either rely on the enemy of his people for protection or return home and be put on trial and possibly sentenced to death. Fate helps him choose the former.
Takes a few months after the story Return to Society. You may be confused if you don't read that first.