Question: On what date did the Battle of the birthplace of Horst H. Berger end?

full_context: Document 1: Ulrich Beck: Beck was born in the Pomeranian town of Stolp, Germany (now Słupsk in Poland), in 1944, and grew up in Hanover. He began university studies with a focus on law at Freiburg, and from 1966 onwards studied sociology, philosophy, psychology and political science at the University of Munich. Starting in 1972, after earning a doctorate, he was employed at Munich as a sociologist. In 1979 he qualified as a university lecturer with a habilitation thesis. He received appointments as professor at the universities of Münster (1979–1981) and Bamberg (1981–1992). From 1992 until his death, Beck was professor of sociology and director of the Institute for Sociology at the University of Munich. He received numerous international awards and honors, including election to the Council and Executive Board of the German Society for Sociology.
Document 2: Battle on the Marchfeld: The Battle on the Marchfeld ("i.e. Morava Field"; ; ) at Dürnkrut and Jedenspeigen took place on 26 August 1278 and was a decisive event for the history of Central Europe for the following centuries. The opponents were a Bohemian (Czech) army led by the Přemyslid king Ottokar II of Bohemia and the German army under the German king Rudolph I of Habsburg in alliance with King Ladislaus IV of Hungary. With 15,300 mounted troops, it was one of the largest cavalry battles in Central Europe during the Middle Ages. The Hungarian cavalry played a significant role in the outcome of the battle.
Document 3: Battle of Mohi: The Battle of Mohi (today Muhi), also known as Battle of the Sajó River or Battle of the Tisza River (11 April 1241), was the main battle between the Mongol Empire and the Kingdom of Hungary during the Mongol invasion of Europe. It took place at Muhi, southwest of the Sajó River. After the invasion, Hungary lay in ruins. Nearly half of the inhabited places had been destroyed by the invading armies. Around 15–25 percent of the population was lost, mostly in lowland areas, especially in the Great Hungarian Plain, the southern reaches of the Hungarian plain in the area now called the Banat and in southern Transylvania.
Document 4: Liselotte Herrmann: Born in Berlin, Liselotte Herrmann, an engineer’s daughter, had a middle class liberal upbringing. After completing her "Abitur" exams in 1929, she went to work as a laboratory assistant in a chemical factory to prepare her studies in chemistry. Later that year, her family moved to Stuttgart, where she attended the Technical College. In 1931, she switched to biology, studying at the Humboldt University in Berlin.
Document 5: Institute of technology: The world's first Institute of Technology the Berg-Schola (Bergschule) established in Selmecbánya, Kingdom of Hungary by the Court Chamber of Vienna in 1735 providing Further education to train specialists of precious metal and copper mining. In 1762 the institute ranked up to be Academia providing Higher Education courses. After the Treaty of Trianon the institute had to be moved to Sopron.
Document 6: Mongol invasion of Kievan Rus': In mid-1238, Batu Khan devastated the Crimea and pacified Mordovia. In the winter of 1239, he sacked Chernigov and Pereyaslav. After many days of siege, the horde stormed Kiev in December 1240. Despite the resistance of Danylo of Halych, Batu Khan managed to take two of his principal cities, Halych and Volodymyr - Volynskyi. The Mongols then resolved to ``reach the ultimate sea '', where they could proceed no further, and invaded Hungary and Poland.
Document 7: Hans Berliner: Hans Jack Berliner (January 27, 1929 – January 13, 2017) was a Professor of Computer Science at Carnegie Mellon University, and was the World Correspondence Chess Champion, from 1965–1968. He was a Grandmaster of Correspondence Chess. He directed the construction of the chess computer HiTech, and was also a published chess writer.
Document 8: Horst H. Berger: Berger was born in Liegnitz (Legnica), Lower Silesia, and received the Vordiplom. from the Technische Hochschule of Dresden, then worked at the IBM Laboratories in Böblingen. Afterwards he became a researcher and teacher at the Technical University of Berlin.
Document 9: Battle of Grunwald: The Battle of Grunwald, First Battle of Tannenberg or Battle of Žalgiris was fought on 15 July 1410 during the Polish–Lithuanian–Teutonic War. The alliance of the Crown of the Kingdom of Poland and the Grand Duchy of Lithuania, led respectively by King Władysław II Jagiełło (Jogaila) and Grand Duke Vytautas, decisively defeated the German–Prussian Teutonic Knights, led by Grand Master Ulrich von Jungingen. Most of the Teutonic Knights' leadership were killed or taken prisoner. Although defeated, the Teutonic Knights withstood the siege of their fortress in Marienburg (Malbork) and suffered minimal territorial losses at the Peace of Thorn (1411) (Toruń), with other territorial disputes continuing until the Peace of Melno in 1422. The knights, however, would never recover their former power, and the financial burden of war reparations caused internal conflicts and an economic downturn in the lands under their control. The battle shifted the balance of power in Central and Eastern Europe and marked the rise of the Polish–Lithuanian union as the dominant political and military force in the region.
Document 10: Battle of Zhongdu: The Battle of Zhongdu (present-day Beijing) was a battle in 1215 between the Mongols and the Jurchen Jin dynasty, which controlled northern China. The Mongols won and continued their conquest of China.
Document 11: Hans John: Hans John was born in Ziegenhain, Hesse, and studied law at the University of Berlin. In 1939, he was hired as a legal assistant at the Aviation Law Institute in Berlin. In June 1940, he was instated into the "Wehrmacht", but after suffering a wound at the Eastern Front, he was released back into academics.
Document 12: Henning Löhlein: Henning Löhlein grew up in Bonn, Germany, studied three years art In the South of France, before coming to Bristol on an Erasmus exchange, where he finished his studies in illustration, before doing an MA at Brighton University in sequential illustration.
Document 13: Battle of Legnica: The Battle of Legnica (), also known as the Battle of Liegnitz () or Battle of Wahlstatt (), was a battle between the Mongol Empire and the combined defending forces of European fighters that took place at Legnickie Pole ("Wahlstatt") near the city of Legnica in the Duchy of Silesia on 9 April 1241.
Document 14: Battle of Liegnitz (1760): The armies collided around the town of Liegnitz (now Legnica, Poland) in Lower Silesia. Laudon's Austrian cavalry attacked the Prussian position in the early morning but were beaten back by General Zieten's Hussars. An artillery duel emerged which was eventually won for the Prussians when a grenade hit an Austrian powder wagon. The Austrian infantry then proceeded to attack the Prussian line, but was met with concentrated artillery fire. A Prussian infantry counter-attack led by the Regiment Anhalt-Bernburg on the left forced the Austrians into retreat. Notably, the Anhalt-Bernburgers charged Austrian cavalry with bayonets, a rare example of infantry assaulting cavalry.
Document 15: Ille Gebeshuber: Ille Gebeshuber studied at the Vienna University of Technology, where she continued to work as a key researcher and lecturer. From 2009 until 2015 she was a professor at the Institute of Microengineering and Nanoelectronics (IMEN) at the National University of Malaysia (UKM). Since 2016 she is back at her home institution, the Vienna University of Technology, at the Institute of Applied Physics. Her book "Wo die Maschinen wachsen: Wie Lösungen aus dem Dschungel unser Leben verändern werden" (Where the machines grow: How solutions from the jungle will change our lives) was shortlisted as Austrian Science Book of the Year 2017.
ground_truth: 9 April 1241
sub_queries: Horst H. Berger >> place of birth Answer: Legnica
On what date did Battle of Legnica end? Answer: 9 April 1241