News came that Brutus and Cassius were assembling an army in order to march on Rome. Antony, Octavian and Lepidus joined as allies, in November 43 BC, to stop Caesar's assassins. The trio were the Second Triumvirate. Brutus and Cassius were defeated by Antony and Octavian at the Battle of Philippi in October 42 BC. After the battle, a new arrangement was made: while Octavian returned to Rome, Antony went on to govern the east of the Republic. Lepidus went to govern Hispania (Spain) and the province of Africa. The triumvirate's enemies were subjected to proscription, including Mark Antony's archenemy Cicero, who was killed on 7 December 43 BC.