Battle of Mopsouhestia (299BC)

The Battle of Mopsouhestia was the first engagement during the First Seleukid-Antigonid War. Alarmed by apparent unopposed Seleukid campaign, Kassandros I Antipator sent an army east to support the Antigonids. Seleukos I Nikator met the army at Mopsouhestia and defeated them, preventing the Macedonians from playing a further role in the war.