Question: The Winter Line was a series of German and Italian military fortifications in Italy, constructed during World War II by Organisation Todt and commanded by Albert Kesselring,  was a German "Luftwaffe Generalfeldmarschall" during which event?

full_context: Document 1: Maginot Line: The Maginot Line (French: "Ligne Maginot" , ] ), named after the French Minister of War André Maginot, was a line of concrete fortifications, obstacles, and weapon installations built by France in the 1930s to deter invasion by Germany. Constructed on the French side of its borders with Switzerland, Germany, and Luxembourg, the line did not extend to the English Channel because the French military did not want to offend neutral Belgium.
Document 2: Battle of Monte Cassino: The Battle of Monte Cassino (also known as the Battle for Rome and the Battle for Cassino) was a costly series of four assaults by the Allies against the Winter Line in Italy held by Axis forces during the Italian Campaign of World War II. The intention was a breakthrough to Rome.
Document 3: Kurt Pflugbeil: Kurt Leopold Pflugbeil (9 May 1890 – 31 May 1955) was a German general (General der Flieger) in the Luftwaffe during World War II who commanded 4th Air Corps and Luftflotte 1. He was a recipient of the Knight's Cross of the Iron Cross with Oak Leaves of Nazi Germany.
Document 4: Erwin Rommel: Erwin Rommel (15 November 1891 – 14 October 1944) was a German general and military theorist. Popularly known as the Desert Fox, he served as field marshal in the Wehrmacht of Nazi Germany during World War II.
Document 5: Günther Rall: Günther Rall (10 March 1918 – 4 October 2009) was a German lieutenant-general, the third most successful fighter ace in history and later head of the West German Luftwaffe during the Cold War.
Document 6: Trasimene Line: The Trasimene Line (so-named for Lake Trasimene, the site of a major battle of the Second Punic War in 217 BCE) was a German defensive line during the Italian Campaign of World War II. It was sometimes known as the Albert Line. The German Commander-in-Chief (C-in-C), "Generalfeldmarschall" Albert Kesselring, used the line to delay the Allied northward advance in Italy in mid June 1944 to buy time to withdraw troops to the Gothic Line and finalise the preparation of its defenses.
Document 7: Erich Hartmann: Erich Alfred Hartmann (19 April 1922 – 20 September 1993), nicknamed "Bubi" ("The Kid") by his German comrades and "The Black Devil" by his Soviet adversaries, was a German fighter pilot during World War II and the most successful fighter ace in the history of aerial warfare. He flew 1,404 combat missions and participated in aerial combat on 825 separate occasions. He claimed, and was credited with, shooting down 352 Allied aircraft—345 Soviet and 7 American—while serving with the "Luftwaffe". During the course of his career, Hartmann was forced to crash-land his fighter 14 times due to damage received from parts of enemy aircraft he had just shot down or mechanical failure. Hartmann was never shot down or forced to land due to enemy fire.
Document 8: Albert Kesselring: Albert Kesselring (30 November 1885 – 16 July 1960) was a German "Luftwaffe Generalfeldmarschall" during World War II. In a military career that spanned both World Wars, Kesselring became one of Nazi Germany's most skilful commanders, and one of the most highly decorated, being one of 27 soldiers awarded the Knight's Cross of the Iron Cross with Oak Leaves, Swords and Diamonds. Nicknamed "Smiling Albert" by the Allies and "Uncle Albert" by his troops, he was one of the most popular generals of World War II with the rank and file.
Document 9: Adolf Dickfeld: Adolf Dickfeld (20 February 1910 – 17 May 2009) was a World War II Luftwaffe officer and 136 victories Flying ace. A flying ace or fighter ace is a military aviator credited with shooting down five or more enemy aircraft during aerial combat. He was also a recipient of the Knight's Cross of the Iron Cross with Oak Leaves (German: "Ritterkreuz des Eisernen Kreuzes mit Eichenlaub" ). The Knight's Cross of the Iron Cross and its higher grade Oak Leaves was awarded to recognise extreme battlefield bravery or successful military leadership.
Document 10: Gothic Line: The Gothic Line (German: "Gotenstellung" ; Italian: "Linea Gotica" ) was a German defensive line of the Italian Campaign of World War II. It formed Field Marshal Albert Kesselring's last major line of defence along the summits of the northern part of the Apennine Mountains during the fighting retreat of the German forces in Italy against the Allied Armies in Italy, commanded by General Sir Harold Alexander.
Document 11: Alfred Keller: In September 1939, when the Second World War begun, the then General Alfred Keller commanded the 4th Air Corps during the invasion of Poland, assuming this command on 13 October 1939. The following campaigns, during campaigns against Norway, the Netherlands, Belgium and the Battle of France, he commanded Luftflotte 2 with General Albert Kesselring as his superior.
Document 12: Roman switch line: The Roman switch line was a German line of defense during World War II in Italy branching off the Caesar C line and running north of Rome towards coast of the Tyrrhenian Sea. The next line was Trasimene Line in central Italy which was intended to delay the Allies and allow the completion of the Gothic Line a major defensive works north of Florence.
Document 13: Winter Line: The Winter Line was a series of German and Italian military fortifications in Italy, constructed during World War II by Organisation Todt and commanded by Albert Kesselring. The series of 3 lines was designed to defend a western section of Italy, focused around the town of Monte Cassino, through which ran the important Highway 6 which led uninterrupted to Rome. The primary Gustav Line ran across Italy from just north of where the Garigliano River flows into the Tyrrhenian Sea in the west, through the Apennine Mountains to the mouth of the Sangro River on the Adriatic coast in the east. The two subsidiary lines, the Bernhardt Line and the Hitler Line ran much shorter distances from the Tyrrehnian sea to just North East of Cassino where they would merge into the Gustav Line. Relative to the Gustav Line, the Hitler Line stood to the North-West and the Bernhardt Line to the South-East of the primary defenses.
Document 14: Devil's gardens: The Devil's gardens was the name given by Erwin Rommel, commander of the German "Afrika Korps" during World War II, to the defensive entanglements of land mines and barbed wire protecting Axis defensive positions during the Second Battle of El Alamein in late 1942. The defences stretch from the Mediterranean coast to the Qattara Depression.
Document 15: Barbara Line: During the Italian Campaign of World War II, the Barbara Line was a series of German military fortifications in Italy, some 10 - south of the Gustav Line, from Colli al Volturno to the Adriatic Coast in San Salvo and a similar distance north of the Volturno Line. Near the eastern coast, it ran along the line of the Trigno river. The line mostly consisted of fortified hilltop positions.
ground_truth: World War II