The lack of eyewitnesses accounts of the battle and the early development of the legend made it difficult to comprehend the facts related to the Battle of Kosovo. What is reliably known are the journey of the Turks from Plovdiv to Gazimestan, the time and place of the event, as well as the deaths of both rulers. The unit of Tvrtko I, King of Bosnia, and Albanian forces also took part in the battle in Lazar's army. The Serbian Empire began to break-up soon after the death Stefan Dušan (1355) and it had already collapsed long before the Kosovo Battle. The outcome of the battle is not clear from the source either. There are different conclusions, but the most common are those about the Ottoman victory. Tim Judah cites the possibility of a Serbian victory, while Noel Malcolm claims that the outcome was a draw. Although Serbia's strategic fall was the Battle of Maritsa in 1371, Kosovo was the spiritual fall of Serbia and a beginning of a new era for the Serbs. The real Kosovo Battle was not as decisive as presented by the myth because the final downfall of medieval Serbian state happened 70 years after it, in 1459, when the Ottomans captured Smederevo.