Immac (Revolt of Elagabalus).
Fought June 7, 218, between the Syrian legions, under Elagabalus, and the Imperial troops and Pretorians, under the Emperor Macrinus. The Pretorians, by their superior valour and discipline, broke the legions opposed, and the victory would have been theirs, but at the crisis of the fight, Macrinus fled, and this so discouraged his troops, that in the end they were totally defeated.