There is an excellent article in this month's Wargames Illustrated by John Bianchi on the second, and less well known, Battle of Kossovo in 1448. John is the primary author of the WAB supplement Vlad the Impaler that I, and fellow WAB players at GDWS, gave some modest assistance with.
Unlike in the first battle of 1389, the Serbian leadership remained loyal to the Ottomans and it was left to the Hungarian's led by Janos Hunyadi, with Wallachian support, to do battle on the Field of Blackbirds. The plan was to join up with the Albanian leader Scanderbeg, but the Ottomans moved quickly to bring the Hungarians to battle before the Albanians arrived. They were only a day's march away. Despite being outnumbered Hunyadi nearly pulled off a famous victory. However, it was Sultan Murad who triumphed and the Christian cause in the Balkans was on the defensive for the next 250 years.
The battlefield today, not surprisingly as the monuments were built by Serbia, focus on the earlier battle. But you can still get a good view of where the action took place as can be seen from the pictures on Balkan Military History.
John's article is well illustrated with 28mm figures from a number of ranges including the fine Kingmaker war wagons that represent the wagonburg in the Hungarian centre. He also presents a scenario for WAB that I look forward to trying out soon. We have done the slightly later Vaslui 1475 as a display game. It was fought in the fog, in case your wondering!