Battle of Ager Sanguinis
1119 CE.
Shown on the map at 36.179°, 36.719°.
In the Battle of Ager Sanguinis, also known as the Battle of the Field of Blood, the Battle of Sarmada, or the Battle of Balat, Roger of Salerno's Crusader army of the Principality of Antioch was annihilated by the army of Ilghazi of Mardin, the Artuqid ruler of Aleppo on 28 June 1119.
Text from the Wikipedia article Battle of the Field of Blood, licensed CC BY-SA 4.0.