Lothar von Richthofen, younger brother of Red Baron Manfred von Richthofen, was a German flying ace credited with 40 confirmed victories in just 77 days flying combat. As the primary arena for aerial combat on the Western Front was over the German trenches and rear works, German aerial and ground observers could usually verify German victories such as Lothar's in considerable detail. The aviation historians cited have further researched his victory claims.