Brutus and Cassius create an army and are going to fight Mark Antony's forces in Northern Greece. They have found out that Antony has joined forces with Octavius and Lepidus, and they are beginning to feel scared.
Brutus and Cassius are worried about the battle and are arguing about funds for their army's pay. They discuss how they are going to distract Antony's army at Philippi, even though they do not yet know that the site is wrong.
Brutus has been told about his wife's suicide, but doesn't show any emotion about the news. Then, he sees the ghost of Caesar as he tries to sleep.
During the battle, Cassius's messenger's horse is overtaken by Mark Antony's army. Cassius is distraught and asks his servant to kill him, as he cannot live knowing he lost.
Brutus finds Cassius's body, and commits suicide. He thinks it is the only option left for him.
Antony has won the battle, and praises Brutus as 'the noblest of them all'. He also orders for there to be a formal funeral before he and Octavius return to rule in Rome.