"The Balkan Wars had revealed both the strengths and the limits of Balkan nationalism. Its strength lay in its ferocity. Its weakness was its disunity. The violence of the fighting much impressed the young Trotsky, who witnessed it as a correspondent for the newspaper Kievskaia mysl. Even the peace that followed the Balkan Wars was cruel, in a novel manner that would become a recurrent feature of the twentieth century. It no longer sufficed, in the eyes of nationalists, to acquire foreign territory. Now it was peoples as well as borders that had to move. Sometimes these movements were spontaneous. Muslims fled in the direction of Salonika as the Greeks, Serbs and Bulgarians advanced in 1912; Bulgarians fled Macedonia to escape from invading Greek troops in 1913; Greeks chose to leave the Macedonian districts ceded to Bulgaria and Serbia by the Treaty of Bucharest."