Siege of Dvin
927 CE.
Shown on the map at 40.004°, 44.578°.
The Siege of Dvin happened in the summer of 927 when the Byzantine army besieged Dvin, which was under Sajid dynasty. The Byzantines were repelled with heavy losses.
Text from the Wikipedia article Siege of Dvin (927), licensed CC BY-SA 4.0.