The area is separated with canals and bridges. Fliers will able to traverse over the canal, giving you extended range and prevent your team from being blocked in bottleneck bridges. The dragon veins in this map are only accessible to Camilla, causing area damage. The bad news is that these dragon veins doesn't burn out; giving Camilla the ability to use it as many times as she needs. It will be good to bring along healers or better yet, offensive Classes capable of using rods at the same time.
Arthur and Effie will be on the upper part of the map. They are Elise's retainers and you can bring your main avatar to talk to any one of them to turn them to your side. Arthur will move on his own but you can help him by healing them in battle. Make your way to Camilla's position and take out her retainers as well. To clear this map, you have to defeat all enemies.