 Complete the following phrase:  Since the encounter at Pločnik in 1386, it was clear to Lazar that a decisive battle with the Ottomans was imminent. After he made peace with Sigismund, to avoid troubles on his northern borders, the prince secured military support from Vuk Branković and King Tvrtko. The King of the Serbs and Bosnia was also expecting a bigger Ottoman offensive since his army, commanded by Vlatko Vuković, wiped out a large Turkish raiding party in the 