Simmons, Shane. "Misfire"
What if: One of Roy Brown's machine guns misfired, and the Red Baron escaped, albeit with a wound which would ground him for the rest of World War I.
Summary: In 1940, as the Nazi occupation of London commences, Brown takes the chance to complete what he failed at decades earlier, but now his target is the head of the Luftwaffe.
Published: In Arrowdreams: An Anthology of Alternate Canadas (eds. Mark Shainblum and John Dupuis), q.v.