Three Feathers from the Horse of Gunn

After his sacrifice to Voldemort in the glade, Harry is offered a Challenge from a deity. Without knowing Her name, Her reason for interest, or any details of the Challenge, he sets off to show the goddess "Courage, Deeds, and Flashing Eyes" wherever (and whenever) he might go. Inspired by the factual World War I aviator Henry Cope Evans. AU. mildly-historical.