Battle of Philippi Part of Liberators' civil war Location of Philippi Date 3 and 23 October 42 BC Location Philippi, Macedonia (modern Greece) Result Decisive Second Triumvirate victory; end of the Liberators' civil war Territorial changes Eastern provinces of Roman Republic given to Mark Antony, Ptolemaic Egypt and Parthia end their support for the Liberators Belligerents Second Triumvirate Liberators, controlling the Eastern provinces of Roman Republic Supported by Ptolemaic Egypt and the Parthian Empire (cavalry force)[1] Commanders and leaders Mark Antony Octavian Marcus Junius Brutus † Gaius Cassius Longinus † Allienus (Unknown) Serapion (Retreats to Tyre) Strength 53,000–108,000[2] 40,000–95,000 infantry in 19 legions[2] 13,000 cavalry[2] 60,000–105,000[2] 40,000–85,000 infantry in 17 legions[2] 20,000 cavalry[2] Casualties and losses 16,000 killed (3 October) 8,000 killed (3 October) Surrender of entire army (23 October)