What deeds does mitty perform in fantasy?

In James Thurber's short story "The Secret Life of Walter Mitty," the protagonist, Walter Mitty, escapes his mundane reality through vivid daydreams where he performs heroic and daring deeds. He imagines himself as a skilled pilot, a brave surgeon, a commanding military leader, and a fearless criminal. These fantasies allow him to experience excitement and confidence that contrast sharply with his timid and unassertive real life. Ultimately, these daydreams reflect his longing for adventure and significance.