Pertempuran Bapheus
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Pertempuran Bapheus


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Pertempuran Bapheus(Turki: Bafeus Muharebesi, Koyun Hisar Muharebesi, Koyunhisar Muharebesi, Yalakova Muharebesi) terjadi pada 27 Juli 1302 antara tentara Utsmaniyah dibawah Osman I dan Byzantine army
under George Mouzalon. The battle ended in a crucial Ottoman victory, cementing the Ottoman state and heralding the final capture of Byzantine Bithynia by the Turks. According to Halil İnalcık, the Ottomans achieved its characteristics and qualities of state after this battle (Bafeus Savaşı) near Yalova.

Strategic context 
Osman I had succeeded in the leadership of his clan in ca. 1282, and over the next two decades launched a series of ever-deeper raids into the Byzantine borderlands of Bithynia. By 1301, the Ottomans were besieging Nicaea, the former imperial capital, and harassing Prussa. The Turkish raids also threatened the port city of Nicomedia with famine, as they roamed the countryside and prohibited the collection of the harvest.

In the spring 1302, Emperor Michael IX (r. 1294–1320) launched a campaign which reached south up to Magnesia. The Turks, awed by his large army, avoided battle. Michael sought to confront them, but was dissuaded by his generals. The Turks, encouraged, resumed their raids, virtually isolating him at Magnesia. His army dissolved without battle, as the local troops left to defend their homes and the Alans too left to rejoin their families in Thrace. Michael was forced to withdraw by the sea, followed by another wave of refugees.

Battle 
To counter the threat to Nicomedia, Michael's co-emperor Andronikos II Palaiologos (r. 1282–1328) sent a Byzantine force of some 2,000 men (half of whom were recently hired Alan mercenaries), under the megas hetaireiarches George Mouzalon, to cross over the Bosporus and relieve the city.

At the plain of Bapheus (; an unidentified site, perhaps to the east of Nicomedia but within sight of the city) on 27 July 1302, the Byzantines met a Turkish army of some 5,000 light cavalry under Osman himself, composed of his own troops as well as allies from the Turkish tribes of Paphlagonia and the Maeander River area. The Turkish cavalry charged the Byzantines, whose Alan contingent notably did not participate in the battle. The Turks broke the Byzantine line, forcing Mouzalon to withdraw into Nicomedia under the cover of the Alan force.

Aftermath 
Bapheus was the first major victory for the nascent Ottoman emirate, and of major significance for its future expansion: the Byzantines effectively lost control of the countryside of Bithynia, withdrawing to their forts, which, isolated, fell one by one. The Byzantine defeat also sparked a massive exodus of the Christian population from the area into the European parts of the Empire, further altering the region's demographic balance. Coupled with the disaster of Magnesia, which allowed the Turks to reach and establish themselves on the coasts of the Aegean Sea, Bapheus thus heralded the final loss of Asia Minor for Byzantium. The Ottoman conquest of Bithynia was nonetheless gradual, and the last Byzantine outpost there, Nicomedia, fell only in 1337.

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Conflicts in 1302
14th century in the Byzantine Empire
Battles involving the Ottoman Empire
Battles involving the Byzantine Empire
Byzantine–Ottoman wars
Medieval Bithynia
Battles in medieval Anatolia
14th century in the Ottoman Empire
14th century in Turkey
History of Yalova Province