Event: Tyrion Lannister - Convincing Argument (Political Wins)

Episode 7: The Dragon and the Wolf at 40:01
Tyrion's meeting with Cersei is succesful, convincing her to not only agree to the truce but to pledge her armies to march north to face the undead threat.

Cersei: "My armies will not stand down. I will not pull them back to the capital. I will march them north to fight alongside you in the Great War. The darkness is coming for us all. We'll face it together. And when the Great War is over, perhaps you'll remember I chose to help with no promises or assurances from any of you."
(Convincing Argument)