Battle of Arsamosta (221 BC)

The Battle of Arsamosata was a battle fought during the opening phases of the First Armenian-Seleukid War. Armenia had hoped to capitalise on preceived political instability and Seleukid preoccupation with rooting out unrest in Gerrha to invade lightly defended Assyria.

Ekdemos quickly marched his army from Antiocheia to meet Phraates at Arsamosata to halt Armenian operations in Assyria. The battle which resulted was a very closely contested engagement, with heavy casaulties on both sides. This prevented the Ekdemos from capitalising on his victory and allowed Astahpa to siege the border forts at Chlomaron until Onomastos I arrived.