The Liberators' civil war was started by the Second Triumvirate to avenge Julius Caesar's assassination. The war was fought by the forces of Mark Antony and Octavian against the forces of Caesar's assassins, led by Marcus Junius Brutus and Gaius Cassius Longinus, referred to as the Liberatores. The latter were defeated by the Triumvirs at the Battle of Philippi in October 42 BC, and committed suicide. Brutus committed suicide after the second part of the battle.