In 1362, Shahin played a central role in the
Ottoman conquest of Adrianople (modern-day
Edirne), a pivotal conquest that marked the beginning of sustained Ottoman control in the Balkans. Following the accession of Murad I, a coordinated campaign was launched to expand Ottoman authority across
Western Thrace, with Adrianople as its primary objective. Shahin, appointed beylerbey of
Thrace, commanded one of three Ottoman forces deployed in a joint operation. While the main army advanced directly on Adrianople under Murad's command, Shahin and
Evrenos Bey led flanking forces to secure surrounding territory and block any interference from Serbian or Bulgarian troops. A key battle unfolded near
Bunar Hisar and
Babaeski, where
Byzantine forces were defeated, clearing the path for the Ottomans to occupy the city. Adrianople, which would remain the empire's capital until the
fall of Constantinople in 1453, became a vital administrative and military hub. The campaign not only severed Byzantine access to Thrace but also strengthened Ottoman capacity to project power across both Europe and
Anatolia. . Following these successes, Shahin directed Ottoman forces in campaigns against Bulgarian and Serbian territories. In 1364, Shahin captured
Boruj and
Plovdiv, further consolidating Ottoman control in the region. Contemporary accounts describe large-scale
enslavement of local populations during these campaigns. According to historian Dimitar Angelov, captives were transported to Sultan Murad's camp in Anatolia, where they were distributed among Ottoman soldiers, with a share reserved for religious leaders. Shahin later played a key role in the
Battle of Maritsa on 26 September 1371, near the village of Chernomen (modern-day
Ormenio, Greece). Ottoman sources occasionally date this campaign to 766 AH (1365 CE), describing a large Serbian force advancing toward Edirne while Murad I was in Anatolia. According to this tradition, Lala Shahin, cut off from reinforcements due to Byzantine control of the
Gallipoli peninsula, coordinated a night-time assault led by
Hacı İlbey near the
Maritsa River. The surprise attack routed the Serbian forces, and the victory became known in Ottoman chronicles as the (Destruction of the Serbs). Turkish historian and Ottomanist Abdülkadir Özcan, questions the reliability of the Ottoman accounts of this engagement. The Ottoman army, under Shahin's command and supported by
Evrenos Bey, faced a Serbian-led coalition commanded by
King Vukašin Mrnjavčević and his brother
Despot Uglješa. The Ottomans’ coordinated night attack resulted in a decisive victory, both Vukašin and Uglješa were killed in the battle, which opened the way for further Ottoman expansion into
Macedonia and parts of Greece. Some historians suggest that Hacı İlbey, a rival general, known for the brilliant but unauthorised attack at Maritsa, may have been poisoned at Shahin's instigation. Historian
J. V. A. Fine describes the Battle of Maritsa as "the Ottomans’ greatest success to that time", more significant than the 1389
Battle of Kosovo in opening the Balkans to Ottoman rule. Following the victory at Maritsa, Shahin supported Murad I in further campaigns into Bulgarian and Serbian territory, targeting the domains of
Ivan Shishman of Tarnovo and other local rulers resisting Ottoman expansion. In 1371, Ottoman forces routed a Christian army at the
Battle of Samokov, southeast of
Sofia, further securing Ottoman control in Bulgaria and accelerating the region's subjugation. In 1383, Shahin conquered Sofia, and from 1383 to 1385, served as the Ottoman governor of Sofia. His rule marked the formal integration of Sofia into the Ottoman administrative system, establishing a model for governance in newly conquered Balkan territories. In 1385–1386, Shahin led an offensive against
Lazar of Serbia, the ruler of
Moravian Serbia, but was defeated on the bank of the
Toplica River at the
Battle of Pločnik. This marked a turning point, as regional powers increasingly resisted Ottoman incursions. Two years later, on 27 August 1388, Lala Shahin suffered another major defeat at the hands of the Bosnian Army of
King Tvrtko I, commanded by
Vlatko Vuković, at the
Battle of Bileća. Some accounts suggest that Shahin had been dispatched by Murad I in response to a request for military support from
George Stracimirović Balšić, the
Lord of Zeta, who sought Ottoman assistance against Tvrtko. The Bosnian forces routed Shahin's troops at
Bileća, north-east of
Dubrovnik, marking a significant setback for Ottoman expansion in the region. According to some scholars, these setbacks may have influenced Murad I's decision to personally lead a new campaign against Lazar, the Serbian sovereign, culminating in the Battle of Kosovo in 1389. == Death and legacy ==