Battle of Bapheus (1322)

Timeline

1. 1320–1322Bithynia · BithyniaAfter consolidating his positions west of the Sakarya River, Osman I continued to press into the Byzantine-held Bithynian hinterland. The Byzantines, exhausted by increasingly frequent Ottoman border raids, saw their frontier defenses weakened, creating conditions for the Ottomans to concentrate their forces for a decisive battle.
2. 1322Bapheus River · BithyniaOttoman forces encountered and engaged Byzantine frontier troops near the Bapheus River. Ottoman cavalry and light infantry fought in coordination, routing the Byzantine army and winning a decisive victory. The battle holds a prominent place in early Ottoman chronicles, seen as a turning point from border raiding to territorial conquest.
3. 1322–1326Bithynia and the southern shore of the Sea of Marmara · AnatoliaThe Byzantine defensive system in Bithynia suffered a severe blow, and Ottoman power advanced further toward key towns such as Nicaea and Bursa. The victory consolidated Ottoman dominance in northwestern Anatolia and laid military and political foundations for Orhan's later capture of strategic cities like Bursa.