Caesar's Civil War: Forces loyal to Julius Caesar led by Gaius Scribonius Curio were defeated by Pompeian Republicans under Publius Attius Varus and King Juba I of Numidia. Caesar's civil war: Caesar's civil war occurred during the late Roman Republic between two factions led by Julius Caesar and Pompey. The main cause of the war was political tensions relating to Caesar's place in the Republic on his expected return to Rome on the expiration of his governorship in Gaul. August 24, 49 BC. Wiki link