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Battle of Maritsa (1371) saw the rise of a new threat, the Ottoman Turks. They began raiding Moravian Serbia in 1381, though the actual invasion came later.<unk> They began raiding Moravian Serbia in 1381, though the actual invasion came later. 1386, Lazar's knights defeated the Ottoman army near Pločnik, in what is today southern Serbia.<unk> In 1386, Lazar's knights defeated the Ottoman army near Pločnik, in what is today southern Serbia. Another invasion by Ottomans came in the summer of 1389, this time aiming towards Kosovo.<unk> Another invasion by Ottomans came in the summer of 1389, this time aiming towards Kosovo.