Answer:

REDBARON

AnswerCrossword Clue
REDBARONSnoopy's foe
REDBARONSnoopy's nemesis
REDBARONManfred Albrecht Freiherr von Richthofen
REDBARONSnoopy's aviator foe
REDBARONSnoopy's archenemy
REDBARON"Flying Circus" nickname
REDBARONTop ace of the Great War
REDBARONGerman ace of W. W. I
REDBARONFamed aviator
REDBARONFamed Fokker flier
REDBARONStrip's bete noire
REDBARONW.W. I fighter pilot who is Snoopy's fantasy opponent
REDBARONW.W. I enemy ace
REDBARONFoe of Snoopy