What major theme does Erich Maria Remarque's novel "All Quiet on the Western Front" primarily illustrate?

Erich Maria Remarque's novel "All Quiet on the Western Front" primarily illustrates the horrors of World War I, highlighting the devastating physical and psychological impacts of war on soldiers. Through the vivid and harrowing experiences of the protagonist, Paul Bäumer, and his comrades, the narrative captures the brutality of trench warfare, the loss of innocence, and the deep sense of disillusionment that follows the soldiers as they confront the grim realities of combat. Remarque effectively conveys the trauma and suffering that are inherent to war, challenging the romantic notions of heroism often associated with military conflict. This theme serves as a poignant critique of the glorification of war and reflects the broader disillusionment felt by a generation affected by the catastrophic consequences of World War I. The focus on individual experiences and emotional turmoil resonates throughout the story, emphasizing how the collective trauma of war shapes the lives of those who survive it.