S1E19 — Fangs of the Enemy

Kira and Cagalli are sent into a nearby ZAFT controlled city to gather supplies with Natarle and the Desert Dawn. The two teenagers get caught in an attack by the Blue Cosmos, and when Kira saves a man who happens to be Andrew Waltfeld, they are invited to the ZAFT base. There, Andrew reveals that he knows Kira is the pilot of the Strike and a Coordinator, but lets them leave safely.