Army size Many details regarding the Battle of Kosovo are uncertain. The composition of both armies is a matter of scholarly dispute, and there exists no reliable information on the topic. Nonetheless, the battle of Kosovo was one of the largest battles of the late medieval times, regardless of the exact army size. A higher estimate suggests a total of 40,000 troops for the Ottomans and 25,000 for Lazar's coalition. Ottoman historian
Mehmed Neşri, who authored the first detailed report in Ottoman historiography about the battle of Kosovo in 1521, placed the size of the Christian coalition at around 500,000, claiming that it was double the size of the Ottoman army. Neşri was presenting an Ottoman imperial narrative, and considering the fact that an Ottoman Sultan died during the battle, Ottoman sources typically exaggerate the size of the Christian army. According to historian
Noel Malcolm, Ottoman writers were most likely eager to build up the size and significance of Lazar's army, which they described as vastly outnumbering Murat's, in order to add to the glory of the "Turkish victory", and it is generally agreed that the Ottoman sources contain exaggerations in favour of the Ottomans. The first known European and Ottoman accounts on the battle in general are strongly influenced by the long-term political consequences of increasing Ottoman conquest, and none of these narratives form a credible basis for the reconstruction of the battle itself, regardless of the author's origins. Murad's army comprised no more than 2,000
Janissaries. Additionally, Murad's army consisted of as many as 8,500 cavalrymen, and the Ottomans were reinforced by their Christian vassals. The Ottoman army likely included a substantial number of non-Turkish contingents, among whom were the forces of two regional
Serbian rulers,
Marko Kraljević and
Konstantin Dejanović, who governed parts of Macedonia and Bulgaria as Ottoman vassals. As a condition of their vassalage, they were obliged to provide troops, and it is generally assumed that they did so and that either one or both rulers personally took part in the battle on the Ottoman side. As suggested by contemporary chronicles and events involving
John VII Palaiologos,
Greek and
Genoese soldiers may also have taken part in the battle as part of the Ottoman army, and it is possible that some
Albanians fought on the Ottoman side as well.
Lazar's coalition The main forces of Lazar's coalition included the Serbian contingent from his own principality, troops brought by his son-in-law,
Vuk Branković, and Bosnian forces under
Vlatko Vuković, sent by Lazar's ally
King Tvrtko of Bosnia. While the great majority of Lazar's army were
Serbs, it also included a coalition of Albanians, Croatians, Hungarians, Vlachs and Bulgarians. Some contemporary Ottoman sources have also claimed that the Czechs and other western Europeans also fought on Lazar's side. Historian
Dejan Djokić initially noted that Bosnians, Bulgarians, Albanians, Vlachs, and Hungarians are believed to have participated in Lazar’s army in addition to the predominantly Serbian forces. He later considered it improbable that Lazar led a broad coalition that included Albanians, Bulgarians, Czechs, Hungarians, Germans, and Vlachs, alongside the Serbian and Bosnian troops. Historian
Daniel Waley has stated that next to nothing can be said with assurance about the numbers and multi-ethnic composition of both armies. before the battle. The Hungarians have been suggested as particularly likely participants among the foreign contingents. Lazar’s son-in-law,
Nicholas Garai, was one of the most powerful noblemen in Hungary, and probably sent a contingent to join Lazar's coalition. According to Malcolm, any senior knight sent by Garai would have held an honoured place. The mythological figure
Miloš Obilić may have been based on a Hungarian knight who is said to have killed Murad, as suggested by some accounts, and this claim is taken seriously by modern scholars. Of those lords, Teodor II Muzaka verifiably fought and died during the battle, alongside a number of fellow Albanians. Albanian historiography focuses on the role of Albanians in Lazar's coalition, whilst Serbian historiography minimises it or ignores it outright. Based on their acceptance of Ottoman sources, Albanian historiography claims that the Albanians under those aforementioned leaders may have accounted for a quarter of Lazar's coalition. Contemporary Greek authors list among participants northern Albanians, those of
Himarë,
Epirus and the coast. Unlike Teodor II Muzaka, the lords Dhimitër Jonima and Đurađ II Balšić are only mentioned in contemporary Ottoman sources. Balšić's presence in particular has been contested and denied by multiple scholars, who assert that Balšić was actually in
Ulcinj at the time of the battle as indicated by a Ragusan invitation, that he was an Ottoman vassal, and that his personal conflicts with Tvrtko I would have made his participation unlikely. Historian Luan Malltezi has argued that although the
Ragusans sent an invitation to Ulcinj, Balšić did not necessarily have to be there to accept it, and that his response arrived in Ragusa only in the final days of August, two months after the battle. A group of crusaders linked to the
Knights of Rhodes, led by
John of Palisna, has been suggested as participants on Lazar's side by Croatian historian
Neven Budak, who quotes in the Italian
Chronicles , "" (Ban John with those marked by a cross). According to Budak, "" probably refers to John of Palisna the Ban of Croatia, but the writer of the Chronicles could have been honouring someone who was no longer a
ban, such as
John Horvat. British historian and Hospitaller scholar
Anthony Luttrell disputes Budak’s assumption that "" means the Knights Hospitaller, stating, “Hospitallers wore a cross but technically were not crusaders or , how the author of the understood the term is uncertain.” Budak himself suggests that the term could simply designate warriors who marked a cross on their clothing, a customary practice before going to war against infidels. Additionally, it has been suggested that
Vlach contingents from
Voivode Mircea were also present in Lazar's army. The wings were fortified with around 1,000
archers, while the
Janissaries held the central position, supported by Murad and his cavalry guard standing behind them. ==Battle==