It is generally a good idea to bait all or some of the enemies towards the bottom right of the map as an opening move.
Amelia and Effie will generally target player units of color disadvantage. Bow Lyn will prioritize fliers and units with low defense. As of the release of this event map, enemy dancers generally prioritize on supporting other units as opposed to targeting a player unit themselves (unless, of course, there is a player unit in range whom they can damage and survive.) See Enemy AI for details.
Horse units can move far enough down by themselves. Flier and infantry units would need movement or dancer assist in order for the bait to work.
Unit Recommendations[ | ]
A Hit and Run flier with Brave weapon can bait bow Lyn onto a non-defense tile at the center, OHKO her and retreat. Common examples include Cordelia, Elincia, Est and Cherche.
Heroes with Triangle Adept skill or weapon combined with color advantage can be used to tank, chip, and eventually kill Amelia and Effie -- after bow Lyn is finished. Olivia with Ruby Sword is thus particularly suitable for the map, as she can also provide Dance and Hone Atk support.