Why is the pilot lost in private peaceful?

In "Private Peaceful" by Michael Morpurgo, the pilot, known as "the flying ace," feels lost due to the psychological trauma and moral dilemmas he faces during World War I. Despite his bravery and skill in the air, he grApples with the horrors of war and the impact of his actions on others. His sense of loss is compounded by the disconnection from his former life and the realization that glory in battle comes at a devastating personal cost. This internal struggle highlights the broader themes of the novel regarding the futility of war and the innocence of youth.