What Happened to Corrin (カムイの行方, lit. Kamui's Whereabouts) is the thirteenth chapter of Fire Emblem Warriors.
Both armies have been pushed back, but Ryoma and Xander are nowhere to be found. The party searches for them until nightfall before finding a pair in a nearby forest.
Seize the S Field Fort, and secure an escape route!
Pair everyone up to avoid the AI attacking Xander and Ryoma, and have them attack the fort, then go capture that fort.