Ardashir I's Siege of Hatra
229 CE.
Shown on the map at 35.588°, 42.718°.
The First siege of Hatra by Ardashir I was an attempt at gaining the fortress of Hatra, which is about 290 km (180 mi) north-west of Baghdad.
Text from the Wikipedia article Ardashir I's siege of Hatra, licensed CC BY-SA 4.0.