During the Second Balkan War, the Battle of Doiran took place in June 1913, where Greek and Bulgarian forces clashed in a fierce confrontation. The conflicts arose from unresolved territorial issues following the First Balkan War, particularly as Bulgaria aimed to extend its influence in Macedonia at the expense of Greece and Serbia. Greek forces, commanded by General Konstantinos Mavromichalis, were tasked with defending and expanding their territorial claims against Bulgaria, which had become increasingly aggressive in its ambitions. The Battle of Doiran saw well-coordinated Greek military strategies, bolstered by the experience gained in previous encounters, which played a crucial role in their operational success.

The battle unfolded with significant artillery and infantry engagements, where the Greeks displayed exceptional bravery and tactical prowess. With Bulgaria's hopes of dominating the region significantly hampered, the outcome provided the Hellenic Army with a critical morale boost. The terrain of Doiran, characterized by hills and strategic vantage points, favored those who could manage the landscape effectively and the Greeks capitalized on this. After intense fighting, the Greek victory at Doiran on June 23 helped to eliminate Bulgarian forces from the area.

The aftermath of the battle led to negotiations that eventually redefined borders in the region following the Treaty of Bucharest. The implications of the Greek victory contributed to the ensuing shift in the balance of power within the Balkan Peninsula, establishing Greece as a formidable force and reshaping the geopolitical landscape of Southeast Europe. This victory solidified Greek claims in Macedonia while also intensifying national sentiments in Bulgaria, which felt betrayed by its erstwhile allies. With the war ending shortly after, the consequences of this conflict were instrumental in paving the way for future tensions in the region leading to World War I.