Peril of Arendelle: Sisters on the frontline

Set in the future Arendelle faces a major crisis. Due to events set in motion by Hans and Elsa the two nations of Arendelle and Royaldelle are at war. In the middle of it is Anna, who has made an error in judgment. How will this war affect these three? And will the sister's relationship ever be the same? An Elsanna fan fic, no flaming and read at your own discretion.