Disclaimer: I do not own the characters or Narnia. They belong to C.S. Lewis.
Edmund was afraid that the world was ending.
As the bombs fell and they were once again rushed to their shelter, and Lucy started crying and their mother comforted her, Edmund remained silent. He sat a corner of the shelter, away from the embraces of everyone else.
Their father was gone, and they had endured countless raids without him. Their mother's strength was waning—she was too afraid, afraid of sending the children away, but afraid that if they stayed they would be harmed. She didn't want them to know, but they knew regardless.
Peter would occasionally look over, taking his eyes off Susan and Lucy and their mother for a moment to look up at his younger brother. Edmund stared back and saw sadness in Peter's eyes, and a sort of grim resigned look. There was fear, too, but it was well contained and Edmund never called Peter on it, although he certainly criticised Peter for everything else.
He really couldn't say anything about fear. He felt it too. He tried to push it aside, tried to distract himself from the others. He got angry when Lucy cried or Susan tried to be affectionate. He hated when Peter tried to be Dad. He hated this whole bloody war.
Edmund just wanted it to stop, but he was afraid to wish for an end because the end might just be death.
Edmund would never tell anyone that he was afraid the world was ending.