Then either Demon Slayer: INF hero, brings INF ATK and INF HP.Snow Queen: RNG hero, brings RNG ATK and RNG HP.Child of Light: CAV hero, brings CAV ATK and CAV HP.Bombin' Goblin (RNG hero): brings ARMY ATK.Rose Knight (CAV hero): brings ARMY ATK (and CAV HP).You can station up to 5 heroes on your wall, so let's pick up one INF ATK hero, one RNG ATK hero, one CAV ATK hero and 2 ARMY ATK heroes from the lists the available F2P heroes. When being attacked, you rarely know which troops are coming for you until the march starts, and because there isn't a 'quick swap' for stationed heroes, your best shot is probably to go for a mixed set of heroes on your wall.