After siding with Nohr, you go to King Garon to inform him of the events at the Bottomless Canyon.
Rout the Enemy
Your enemies here are all Faceless. They are easy enough to defeat, especially when some new units arrive to help you out. The boss unit is slightly tougher, but nothing that you can't handle. Just be sure to keep your units in groups near each other so they can help each other fight.
After this battle, the next is in Chapter 8: Cold Reception.