Who is the unknown rifleman that shot the red baron?

The identity of the unknown rifleman who shot down the Red Baron, Manfred von Richthofen, remains debated among historians. The most widely accepted theory attributes the fatal shot to Australian pilot Arthur "Roy" Brown, who was leading a squadron in the area. However, some accounts suggest that the shot may have come from ground fire, possibly from a soldier named Cedric Popkin of the Australian Imperial Force. The exact details of the incident on April 21, 1918, are still shrouded in uncertainty.