“On September 30, 1912, Europe awoke to a historic day. For the first time, the Christian states on the Balkan Peninsula, which had until then been fragmented, emerged as allies and ordered a general mobilization of their armies to resolve an antiquated problem.” The Balkan War, which resulted from this secret alliance formed by the Balkan states, not only changed the fate of the Ottoman Empire but also plunged the Balkan Peninsula into an endless era of chaos. During this process, the Balkan states fell into disagreement over the territories they occupied following the military success they achieved against the Ottoman Empire with unexpected speed, and the Bulgarians realized that the amount of land they obtained in return for their struggle against the Ottoman Empire did not meet their expectations. The Balkan states, having disagreements particularly over Macedonia, entered into a bloody war among themselves. Ivan E. Geshov, one of the founding architects of the Balkan League and Prime Minister of Bulgaria during the Balkan War, resigned from his post due to allegations that he had made excessive concessions to Serbia and Greece. Regarding this dispute and the war that broke out among the Balkan states, Ivan E. Geshov stated, “It seems to me that the authors of the path that led the Balkan League to such dire consequences have a duty to tell the truth to both their own countries and humanity in general.” He argued that the treaties upon which the Balkan League was based were already public, and therefore, there was no reason to maintain the secrecy of the motives that inspired these treaties, the negotiations conducted before their signing, or the reasons that led to their collapse. He expressed that because the treaties in question were made in Sofia, Bulgaria was at the head of the Balkan League, had made greater sacrifices than all other allies combined in the war against Turkey, and was one of those who conducted the negotiations, he chose to be the first to break the silence. Geshov explained in detail how the Balkan League was established, what it did, how much effort he exerted to save it from destruction, and that the Bulgarian nation was not largely responsible for the collapse of this alliance in his work titled ‘The Balkan League’. For this reason, the work holds the distinction of being one of the important sources in Turkish historiography regarding Balkan history and the Balkan War.