In this task, you are given a set of context paragraphs, some supporting facts and an answer of a question. Your task is to generate question for given answer based on set of context paragraphs, supporting facts and an answer.

Context_1 : Hans-Arnold Stahlschmidt (15 September 1920 missing in action 7 September 1942) was a German fighter pilot during World War II. A flying ace, he was credited with 59 victories against the Western Allies in North Africa. Stahlschmidt was a close friend of the prominent ace Hans-Joachim Marseille. Context_2 : Derek Harland Ward, (31 July 1917 17 June 1942) was a New Zealand flying ace of the Second World War. He was credited with six kills, one shared destroyed, one probable and four damaged against the "Luftwaffe". Ward was shot down and killed by the German ace Hans-Joachim Marseille. Among his notable victories was a Focke-Wulf Fw 200 "Condor", destroyed on 1 May 1942. Context_3 : Risto Stijovic (; 8 October 1894 Podgorica, Principality of Montenegro 20 December 1974 Belgrade, SR Serbia, SFRY) was a Yugoslav sculptor, considered to be one of the most original artists of his time. He was born in centre of Montenegrin capital Podgorica. In 1912 he enrolled in Serbian school of fine arts in the class of ore Jovanovic. After the war broke out he joined the Serbian Army and retreated across Albania to Corfu. In 1916 he moved to Marseille, furthering his education at Marseille art school on French government schoolarship, and then on to Paris the following year, where he continued at Ecole des Beaux-Arts. He lived for years in Paris, where he met his wife, Jeanette, whom he married in 1922. Considered one of the most talented sculptors of the early 20's, he exhibited together with Picasso, Matisse, Pompon and Maillol. In 1928 he moved back to Belgrade where he became professor at Third Male Gymnasium. In 1941 he was arrested and imprisoned in Banjica concentration camp, where he spent the rest of WW2. After the war he continued his life in Belgrade, becoming a member of SASA in 1965. He died in Belgrade in 1974. He was buried in the Cepurci cemetery of Podgorica. Stijovic's work was inspired by Yugoslav nature and culture. He is considered to be the most important Montenegrin sculptor. He is considered to be a master of sculpturing animal figures. Context_4 : Hans-Joachim Walter Rudolf Siegfried Marseille (13 December 1919 30 September 1942; ] ) was a German fighter pilot during World War II. 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. Context_5 : 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. Context_6 : 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. Context_7 : Der Stern von Afrika (English: The Star of Africa ) is a 1957 black-and-white German war film portraying the combat career of a World War II Luftwaffe fighter pilot Hans-Joachim Marseille. It stars Joachim Hansen and Marianne Koch and was directed by Alfred Weidenmann, whose film career began in the Nazi era. Context_8 : MOLPRO is a software package used for accurate "ab initio" quantum chemistry calculations. It is developed by Peter Knowles at Cardiff University and Hans-Joachim Werner at Universitat Stuttgart in collaboration with other authors. Context_9 : This is a listing of the major works of Louis Botinelly, a French sculptor born in Digne on 2 January 1883 and dying in Marseille on 26 March 1962. His father was a mason, originally from Tessin in Switzerland, who had a workshop in Digne before the family moved to Marseille when his father inherited a workshop there from his brother. Thanks to a bursary from the city of Marseille, Botinelly was able to stay in Italy for a period in 1902 and then study in Paris under Jules Coutan. He moved to Paris in 1906. In 1914 he was conscripted and joined the 7th Regiment of Engineers in Avignon. The huge demand for war memorials after 1918 meant that in the early 1920s he received many commissions for war memorial sculptures as evidenced in the listing below. In some records the sculptor's name is recorded as "Botinelli". Context_10 : Werner Schroer (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. A flying ace or fighter ace is a military aviator credited with shooting down five or more enemy aircraft during aerial combat. Schroer 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. For the fighter pilots, the grades of the Knight's Cross were also a quantifiable measure of their success and skill. Werner Schroer was the second most successful claimant of air victories after Hans-Joachim Marseille in the Mediterranean. fact_1 : Werner Schroer (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. fact_2 : Hans-Joachim Walter Rudolf Siegfried Marseille (13 December 1919 30 September 1942; ] ) was a German fighter pilot during World War II. Answer: World War II
In what war did Werner Schroer and HansJoachim Marseille fly?