Question: What German ace-of-aces was shot down by Cedric Bassett Popkin during World War 1?
Sentence (from "Manfred von Richthofen"): Manfred Albrecht Freiherr von Richthofen (2 May 1892 – 21 April 1918), also known as the "Red Baron", was a fighter pilot with the German Air Force during World War I.
Relevant evidence: No