In the First Balkan War in 1912, as commander of the First Army, Crown Prince Alexander fought victorious battles in Kumanovo and Bitola. One of Alexander's most cherished moments came when he drove the Ottomans out of Kosovo and on 28 October 1912 led the Serb Army on a review on the Field of Blackbirds. The Field of Blackbirds was where the Serbs under Prince Lazar had been defeated in a legendary battle by the Ottoman Sultan Murad I on 28 June 1389 and is regarded by the Serbs as holy ground. It was a great honor for him to pay his respects to the Serbs who had fallen in that earlier battle. In the aftermath of the First Balkan War, disputes emerged among the victors over control of Macedonia, and Serbia and Greece signed an alliance against Bulgaria. Later in 1913, during the Second Balkan War, Alexander commanded the Serb Army at the Battle of Bregalnica against the Bulgarians.