Question: On what date was the end of the battle named after the city where Hugo Rühle was born?

full_context: Document 1: 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 2: August von Rothmund: In 1853 he received his doctorate from the University of Munich, and furthered his studies in Berlin under Albrecht von Graefe (1828–1870); in Prague with Carl Ferdinand von Arlt (1812–1887) and in Vienna with Eduard Jäger von Jaxtthal (1818–1884). In 1854 he returned to Munich, where he became director of the surgical policlinic (Reisingerianum). In 1863 he was appointed "full professor", at the University of Munich, where he practiced ophthalmology until his retirement in 1900. He was the son of noted surgeon Franz Christoph von Rothmund (1801–1891).
Document 3: 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 4: Hans Würtz: Hans Würtz, born Johannes Würtz (18 May 1875, Heide, Holstein - 13 July 1958, Berlin) was one of the most influential and controversial figures in German "Krüppelpädagogik" (special education) during the Weimar Republic. He wrote over 50 books. He is buried at the Waldfriedhof Dahlem in Berlin.
Document 5: Hugo Rühle: Hugo Ernst Heinrich Rühle (12 September 1824 – 11 July 1888) was a German physician born in Liegnitz (today Legnica, Poland).
Document 6: Johann Lucas Boër: Johann Lucas Boër (20 April 1751 in Uffenheim, "Grafschaft Ansbach" – 19 January 1835 in Alsergrund), originally Johann Lucas "Boogers" (sometimes spelled Rogers Lucas Johann Boër) was a German medical doctor and obstetrician.
Document 7: Rüdiger Kuhlbrodt: Rüdiger Kuhlbrodt was born in Hamburg, Germany, on 20 November 1942. After high school, he studied performing arts at the Hochschule für Musik und Theater Hamburg
Document 8: Ernst Ruh: Ernst Ruh received his doctorate in 1964 from Brown University under Katsumi Nomizu with thesis "On the Automorphism Groups of a G-structure". He is a professor at Ohio State University and a professor of computer science at the University of Basel (1987/89). In 1990 Ruh became a full professor (professor ordinarius) of mathematics at the University of Fribourg; he was the successor of Josef Schmid. In 2006 he retired as professor emeritus.
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 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 11: King Jagiello Monument: The King Jagiełło Monument is an equestrian monument of Władysław II Jagiełło, King of Poland and Grand Duke of Lithuania, located in Central Park, New York City. The monument commemorates the Battle of Grunwald, a decisive defeat of the Teutonic Order in 1410. Originally made for the Polish 1939 New York World's Fair pavilion, the monument was permanently installed in Central Park in 1945. Raised on its grand plinth it is one of the most prominently-sited and impressive of twenty-nine sculptures located in the park.
Document 12: 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 13: 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 14: 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 15: 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.
ground_truth: 9 April 1241
sub_queries: Hugo Rühle >> place of birth Answer: Legnica
On what date did Battle of Legnica end? Answer: 9 April 1241