Alliance wars - Sudden defeat

How can it be that a whole alliance with all 10 islands is swiped off the war map not even 30 minutes after the war started. Can someone explain please?THANKS.

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You can’t. To be eliminated you need to lose your 3 fiefdoms on the map, so at least one day if you are attacked by 3 alliances

Would it be possible to have the exact name of your Alliance please?