For all you Fire Emblem Heroes Players out there, The mobile game has brought some more special maps for you to play and conquer. These maps are a little different to all the others as you have to take a more defensive approach as there are special tiles that if your units get attacked on them, they will take less damage. You can see for youself in the screenshots below.
If you have yet to claim Ursula for your own, you will have a second chance as she returns tomorrow in the next Grand Hero Battle. She is effective against Calvary units so be sure to go up against her with infantry if you want to stand a chance.
Source: Fire Emblem Heroes In-Game Notification & Fire Emblem Heroes Official Twitter Account