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

<P0-S0> 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. <P0-S1>  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. <P0-S2>  "Flieg' Vogel fliege" was recorded at Roedelius' home studio and completed at Erpelstudio, Vienna, Austria. <P0-S3>  "Flieg' Vogel fliege" was released by Sky Records on vinyl in 1982. <P0-S4>  "Flieg' Vogel fliege" was the final album Roedelius recorded for Sky Records. <SEP> <P1-S0>  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. <P1-S1>  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. <P1-S2>  On inspection of the box they found it had a false bottom under which were one hundred letters and government bonds. <P1-S3>  After further investigation von Clemm was arrested on 28 January 1942 and was sentenced to two years in prison for his crime. <P1-S4>  In 1940 the Nazis seized large quantities of diamonds from Belgium and the Netherlands, which Werner was smuggling to the U.S. <P1-S5> 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. <P1-S6>  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. <P1-S7>  The letters detailed Werner's diamond smuggling operation. <P1-S8>  Along with his twin brother, Karl he had become friends with U.S. oil man, William Rhodes Davis. <P1-S9>  In 1922 he immigrated to the United States. <P1-S10>  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. <P1-S11>  On his release he entered private banking. <P1-S12>  His father-in-law was a Vice President of Citibank. <P1-S13>  The United States was neutral and did not declare war until December 1941. <P1-S14>  Prior to this he had served in the German army during World War I. <SEP> <P2-S0>  A flying ace or fighter ace is a military aviator credited with shooting down five or more enemy aircraft during aerial combat. <P2-S1> 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. <P2-S2>  Schröer was also a recipient of the Knight's Cross of the Iron Cross with Oak Leaves and Swords. <P2-S3>  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. <P2-S4>  For the fighter pilots, the grades of the Knight's Cross were also a quantifiable measure of their success and skill. <P2-S5>  Werner Schröer was the second most successful claimant of air victories after Hans-Joachim Marseille in the Mediterranean. <SEP> <P3-S0>  A flying ace, he is noted for his aerial battles during the North African Campaign. <P3-S1>  Marseille claimed all but seven of his 158 victories against the British Desert Air Force over North Africa. <P3-S2> Hans-Joachim Walter Rudolf Siegfried Marseille (13 December 1919 – 30 September 1942; ] ) was a German fighter pilot during World War II. <P3-S3>  No other pilot claimed as many Western Allied aircraft as Marseille.