Question: Battle of Kosovo was the culmination of a Hungarian offensive to avenge the defeat in a battle that took place on which day ?

full_context: Document 1: Battle of Mohács: The Battle of Mohács (] ; Hungarian: "Mohácsi csata" , Turkish: "Mohaç Muharebesi" ) was one of the most consequential battles in Central European history. It was fought on 29 August 1526 near Mohács, Kingdom of Hungary, between the forces of the Kingdom of Hungary, led by Louis II, and those of the Ottoman Empire, led by Suleiman the Magnificent. The Ottoman victory led to the partition of Hungary for several centuries between the Ottoman Empire, the Habsburg Monarchy, and the Principality of Transylvania. Further, the death of Louis II as he fled the battle marked the end of the Jagiellon dynasty in Hungary and Bohemia, whose dynastic claims passed to the House of Habsburg.
Document 2: War of the Polish Succession (1587–88): The War of the Polish Succession or the Habsburg-Polish War took place from 1587 to 1588 over the election of monarch after the death of King of Poland and Grand Duke of Lithuania Stephen Báthory. The war was fought between factions of Sigismund III Vasa and Maximilian III, with Sigismund eventually being crowned King of Poland and Grand Duke of Lithuania. Two major battles of this conflict included the Siege of Kraków, in which Maximilian III failed to capture the capital of the Commonwealth, and the Battle of Byczyna, in which Maximilian was forced to surrender. Sigismund's victory was significantly the doing of Chancellor and Hetman Jan Zamoyski, who stood behind both the political intrigue and the military victories of this conflict.
Document 3: 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 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 4: Battle of Suzdal: The Battle of Suzdal or the Battle of the Kamenka River was fought of July 7, 1445 between Russians under Vasily II and Tatars troops of Oluğ Möxämmäd, invaded the principality of Nizhny Novgorod. Russians were defeated by troops of beg Mäxmüd, who became Mäxmüd of Kazan some after the battle. Vasily was taken prisoner and was set free only after the enormous ransom was paid. He also promised restitution of the lands of Mishar Yurt, that were bought from Tokhtamysh in 1343. Qasim Khanate was founded there to become a buffer state and the vassal of Muscovy later.
Document 5: Peace of Vasvár: The Peace of Vasvár was a treaty between the Austrian Habsburg Monarchy and the Ottoman Empire which followed the Battle of Saint Gotthard of 1 August 1664 (near Mogersdorf, Burgenland), and concluded the Austro-Turkish War (1663-1664). It held for about 20 years, until 1683, during which border skirmishing escalated to a full-scale war and culminated with the Ottoman's siege of Vienna for the second time.
Document 6: Ottoman–Habsburg wars: The Ottoman–Habsburg wars were fought from the 16th through the 18th centuries between the Ottoman Empire and the Habsburg (later Austrian) Empire, which was at times supported by the Holy Roman Empire, Kingdom of Hungary and Habsburg Spain. The wars were dominated by land campaigns in Hungary (including Transylvania and Vojvodina), Croatia and Central Serbia.
Document 7: Battle of Vienna: The Battle of Vienna (German: "Schlacht am Kahlen Berge" or "Kahlenberg"; Polish: "bitwa pod Wiedniem" or "odsiecz wiedeńska" (The Relief of Vienna); Modern Turkish: "İkinci Viyana Kuşatması", Ottoman Turkish: "Beç Ḳalʿası Muḥāṣarası") took place at Kahlenberg Mountain near Vienna on 1683 after the imperial city had been besieged by the Ottoman Empire for two months. The battle was fought by the Habsburg Monarchy, the Polish–Lithuanian Commonwealth and the Holy Roman Empire, under the command of King John III Sobieski against the Ottomans and their vassal and tributary states. The battle marked the first time the Commonwealth and the Holy Roman Empire had cooperated militarily against the Ottomans, and it is often seen as a turning point in history, after which "the Ottoman Turks ceased to be a menace to the Christian world". In the ensuing war that lasted until 1699, the Ottomans lost almost all of Hungary to the Holy Roman Emperor Leopold I.
Document 8: Battle of Varna: The Battle of Varna took place on 10 November 1444 near Varna in eastern Bulgaria. The Ottoman Army under Sultan Murad II defeated the Hungarian–Polish and Wallachian armies commanded by Władysław III of Poland (also King of Hungary), John Hunyadi (acting as commander of the combined Christian forces) and Mircea II of Wallachia. It was the final battle of the Crusade of Varna.
Document 9: Amir Sultan: Amir Sultan (1368–1429) was Amir Kulal Shamsuddin’s grandson. He was invited by the Ottoman Sultan Bayezid I to Anatolia. Bayezid I had a daughter from his marriage with Daulat Khatun (Devlet Hatun) who was married to Amir Sultan. Daulat Khatun (Devlet Hatun) was a descendant of Jalal ud-Din Rumi. By the end of fourteenth century Timur and Bayezid I had emerged as two superpowers in Asia and Europe, making the confrontation between two a matter of time. Timur took the lead and conquered the Ottoman city of Sivas, disseminating the local population in his trademark style. At the same time two princes, Ahmad Jalair (Ahmad (Jalayirids)) and Kara Yosuf (Qara Yusuf) sought for protection at Bayezid I's court. Their territories had been conquered by Timur. Timur sent two embassies demanding surrender of the two princes, but Bayezid I refused. Bayezid I went a step further and prepared for an attack on Timur’s territory. At this point his son-in-law Amir Sultan advised him against the move knowing well the penchant and proficiency of Timur and his soldiers in a battlefield. However, his genteel council fell on deaf ears. Instigated and incited by the two princes Bayezid I seized Erzurum which was under Timur’s rule. To Timur this was declaration of war and in his symbolic manner he started conquering Ottoman cities one by one with whirlwind speed. Bayezid I took his army to stop Timur and the two goliaths met at the plains of Angora on 20 July 1401 (804AH). Although Bayezid I had made a fierce reputation in Europe as a brilliant general and ferocious warrior but he was no match for Timur whose years in battlefield far exceeded Bayazid’s age. The Mongol attack was ruthless and merciless and in one word, Timur “annihilated” the Ottoman army, taking Bayezid I, his children and princes as captives.
Document 10: Battle of Kosovo (1448): The Second Battle of Kosovo (Hungarian: "második rigómezei csata", Turkish: "İkinci Kosova savaşı") (17–20 October 1448) was a land battle between a Hungarian-led Crusader army and the Ottoman Empire at Kosovo Polje. It was the culmination of a Hungarian offensive to avenge the defeat at Varna four years earlier.
Document 11: Battle of Zenta: The Battle of Zenta or Battle of Senta, fought on 11 September 1697 just south of Zenta (Serbian: Senta; then part of the Ottoman Empire; today in Serbia), on the east side of the Tisa river, was a major engagement in the Great Turkish War (1683–1699) and one of the most decisive defeats in Ottoman history. In a surprise attack, Habsburg Imperial forces routed the Ottoman army which was crossing the river. At the cost of a few hundred losses, the Habsburg forces inflicted thousands of casualties on the Ottomans, dispersed the remainder and captured the Ottoman treasure. As an immediate consequence, the Ottoman Empire lost control over Banat, while in the long run, the Habsburg victory at Zenta was the last decisive step to force the Ottoman Empire into the Treaty of Karlowitz (1699), ending the Ottoman control of large parts of Central Europe.
Document 12: Battle of Kosovo: The Battle of Kosovo took place on 15 June 1389 between the army led by the Serbian Prince Lazar Hrebeljanović and the invading army of the Ottoman Empire under the command of Sultan Murad Hüdavendigâr. The army under Prince Lazar consisted of his own troops, a contingent led by Serbian nobleman Vuk Branković, and a contingent sent from Bosnia by King Tvrtko I, commanded by Vlatko Vuković. Prince Lazar was the ruler of Moravian Serbia, and the most powerful among the Serbian regional lords of the time, while Vuk Branković ruled District of Branković located in a part of Kosovo and other areas, recognizing Lazar as his overlord. The battle was fought on the Kosovo Field, in the territory ruled by Branković, in what is today Kosovo. Its site is about 5 km northwest of the modern city of Prishtina.
Document 13: Battle of Hatvan: The Battle of Hatvan was the first battle in the Spring Campaign of the Hungarian War of Independence from 1848–1849, fought on 2 April 1849 between the Habsburg Empire and the Hungarian Revolutionary Army. This battle was the start of the Hungarian offensive, which had the purpose to liberate the Central and Western parts, and the capital of Hungary, occupied by imperial forces. The Austrian force were led by General Franz Schlik, while the Hungarians were led by Colonel András Gáspár, and lieutenant-colonel Ernő Poeltenberg. In the Hungarian army fought also the Polish Legion under the lead of Colonel Józef Wysocki. The Hungarians were victorious, and advanced towards the Hungarian capitals, Buda and Pest.
Document 14: Battle of Mokra (1445): The Battle of Mokra took place on October 10, 1445 near mountain Mokra (today in Makedonski Brod, Macedonia). It was an Ottoman retaliation to a message sent by Skanderbeg to Murad II. The Albanian forces under Skanderbeg defeated the Ottoman forces under Firuz Pasha. It was the second major Albanian victory over the Ottoman Empire.
Document 15: Battle of Murowana Oszmianka: The Battle of Murowana Oszmianka of May 13–May 14, 1944 was the largest clash between the Polish resistance movement organization Home Army (Armia Krajowa, AK) and the Lithuanian Territorial Defense Force (LTDF); a Lithuanian volunteer security force subordinated to Nazi Germany occupational administration. The battle took place in and near the village of Murowana Oszmianka in Generalbezirk Litauen "Reichskommissariat Ostland" (modern Muravanaya Ashmyanka, Belarus, former Murowana Oszmianka, Second Polish Republic). The outcome of the battle was that the 301st LTDF battalion was routed and the entire force was disbanded by the Germans soon afterwards.
ground_truth: 10 November 1444