Why do Charlie Chaplin starts the film in the trenches of World War 1?

Charlie Chaplin begins "Shoulder Arms" in the trenches of World War I to highlight the absurdity and tragedy of war. By placing his character in this grim setting, Chaplin juxtaposes the seriousness of the conflict with his signature comedic style, creating a poignant commentary on the human experience during wartime. This opening establishes both the chaotic environment and the personal struggles faced by soldiers, setting the stage for the film's exploration of courage, camaraderie, and the absurdities of military life.