Question: In what war did Werner Schröer and Hans-Joachim Marseille fly?

 A flying ace, he is noted for his aerial battles during the North African Campaign.  Marseille claimed all but seven of his 158 victories against the British Desert Air Force over North Africa.  No other pilot claimed as many Western Allied aircraft as Marseille. Hans-Joachim Walter Rudolf Siegfried Marseille (13 December 1919 – 30 September 1942; ] ) was a German fighter pilot during World War II. <SEP>  A flying ace or fighter ace is a military aviator credited with shooting down five or more enemy aircraft during aerial combat.  Schröer was also a recipient of the Knight's Cross of the Iron Cross with Oak Leaves and Swords.  The Knight's Cross of the Iron Cross and its higher grade Oak Leaves and Swords was awarded to recognise extreme battlefield bravery or successful military leadership. Werner Schröer (12 February 1918 – 10 February 1985) was a German World War II fighter ace who served in the "Luftwaffe" from 1937, initially as a member of the ground staff, until the end of World War II in Europe on 8 May 1945, by which time he had reached the highest ranks of combat leadership.  For the fighter pilots, the grades of the Knight's Cross were also a quantifiable measure of their success and skill.  Werner Schröer was the second most successful claimant of air victories after Hans-Joachim Marseille in the Mediterranean. <SEP> Werner C. von Clemm (27 September 1897 - 14 April 1989, Biddeford, Maine) was born into a German family that married into German nobility, the Nazi party and prominent American families.  His father-in-law was a Vice President of Citibank.  In 1922 he immigrated to the United States.  Prior to this he had served in the German army during World War I.  He was a representative of the German international banking firm Hardy & Co. and an employee of the Pioneer Import Corp., which imported materials from Germany and handled his cousin and Nazi diplomat, Joachim von Ribbentrop's champagne business.  Along with his twin brother, Karl he had become friends with U.S. oil man, William Rhodes Davis.  In the United States Werner became Vice President of Davis' company Davis & Co., which shipped large quantities of oil to Germany and became a propaganda strategist and financial aid of the America First Committee, which encouraged American isolationism.  In 1940 the Nazis seized large quantities of diamonds from Belgium and the Netherlands, which Werner was smuggling to the U.S.  The United States was neutral and did not declare war until December 1941.  To avoid detection he moved the diamonds through various European cities, shipped them to South America and they eventually found their way to New York City.  The operation was stumbled upon by mistake by agents of the Treasury Department when they searched a Budweiser beer box being carried by two American soldiers of German descent.  On inspection of the box they found it had a false bottom under which were one hundred letters and government bonds.  The letters detailed Werner's diamond smuggling operation.  After further investigation von Clemm was arrested on 28 January 1942 and was sentenced to two years in prison for his crime.  On his release he entered private banking.  He was also an agent of the German intelligence agency, Abwehr and was involved in espionage during World War II. <SEP> Flieg' Vogel fliege (German for "Fly Bird Fly") is the ninth solo album by keyboardist Hans-Joachim Roedelius, best known for his work with Cluster, Harmonia, and Aquarello.  According to Roedelius biographer Stephen Iliffe this album is also titled "Selbstportrait IV", but that name does not appear on the album sleeve or label.  "Flieg' Vogel fliege" was recorded at Roedelius' home studio and completed at Erpelstudio, Vienna, Austria.  "Flieg' Vogel fliege" was released by Sky Records on vinyl in 1982.  "Flieg' Vogel fliege" was the final album Roedelius recorded for Sky Records.