In the episode No One, Jaime Lannister persuades (intimidates?) Edmure Tully to return to castle Riverun and order his vassals within to surrender, which they do despite the warden Brnyden (the Blackfish) Tully's protests.
This is depicted as a nonviolent resolution, but what becomes of the Tullys afterward? I highly doubt the Lannisters will just let the Tullys stay there, and Brynden pretty much spat on Brienne's offer that would have granted them safe passage to Sansa's forces- where did they go?