—Act V, scene i, lines 100-2
Stoicism held it wrong to seek refuge in suicide. The good man must meet his fate, whatever it is, unmoved. Cassius asks, sardonically, if Brutus is ready, then, in case of defeat, to be led in triumph behind the conqueror's chariot through the Roman streets (and, undoubtedly, with the jeers of the Roman populace ringing in his ears).
At once, Brutus' Stoicism fails him. As long as his Stoic demeanor brings him praise, it is well. If it is going to bring him disgrace he abandons it But he does so with characteristic self-praise:
—Act V, scene i, lines 110-12
Since both plan to die in case of defeat, they may never meet again. Brutus says:
—Act V, scene i, line 116
Cassius answers in kind and both are now ready for the battle, which takes up the rest of the play.
On both sides there was double command. Cassius on the seaward side opposed Antony; Brutus on the inland side opposed Octavius. The fortunes differed on the two flanks. Brutus had the advantage over Octavius and advanced vigorously. He sends messages of victory to the other flank by Messala, saying:
—Act V, scene ii, lines 3-6
But even now, in the midst of victory, Brutus judges wrongly. Brutus should, at all cost, have kept his part of the army from advancing in such a way that they could not support the other part in case of need. Instead, his men are overvictorious and fall to looting, when they ought to have wheeled down upon Antony's men.
Antony's army manages instead to drive hard against Cassius' wing. That wing breaks and flies and can receive no help. Titinius, Cassius' aide, says bitterly:
—Act V, scene iii, lines 5-8
Cassius' depression now costs him the final price. He does not realize the exact magnitude of Brutus' victory and therefore does not understand that even allowing for his own defeat, the battle is no worse than drawn.
A band of Brutus' horsemen making their way toward him is mistaken by him for the enemy. When his aide, Titinius, reconnoitering, embraces them gladly, the nearsighted Cassius thinks he is taken prisoner and that his own capture is imminent.
Cassius therefore calls his servant, Pindarus, saying:
—Act V, scene ii, lines 37-40
In Parthia, at the Battle of Carrhae, eleven years before, Cassius had carried through the greatest military achievement of his life. He had carefully husbanded the downhearted remnants of a defeated army and had safely brought them back to Syria.
He had not despaired then, but he did now. He orders his slave to kill him with the same sword that had once pierced Caesar. It is done and Cassius dies.
When the news of Cassius' death is brought to Brutus, he comes to view the body and says:
O Julius Caesar, thou art mighty yet!
—Act V, scene iii, lines 94-96
His eulogy over Cassius is:
—Act V, scene iii, lines 99-101
The statement is a gross exaggeration. Except for his conduct at the Battle of Carrhae, Cassius had shown little real ability. Even in organizing the successful conspiracy that killed Caesar, his weakness in allowing the stupid Brutus to guide affairs ruined all.
Shakespeare has the battle continuing as though it were all one piece. That is not so in actual history.
After the drawn battle in which Cassius killed himself unnecessarily and Brutus was victorious on his wing, the two armies withdrew to lick their wounds.
Brutus' army still held the stronger position and, what's more, Brutus controlled the sea approaches so that supplies were denied Antony and Octavius. He had but to stay where he was and he would still win.
But he could not. The habit of wrong judgments could not be broken and this time there wasn't even Cassius present to argue vainly with him. After twenty days he marched to the attack again in a straightforward head-to-head battle.
He lost again, brought the remnants back to a strong position once again, and might have sold his last bit dear, but that his soldiers refused to fight any more.
There was nothing left to do but find somebody to kill him. This service was performed for him by his servant, Strato, who held the sword while Brutus ran upon it, saying:
—Act V, scene v, lines 50-51
To the end the talk is of Caesar…
There remains only the eulogy to be delivered over Brutus. Antony, surveying the dead body, says:
—Act V, scene v, lines 68-72
Plutarch reports that "it was said" that Antony had, on a number of occasions, said something like this. Was it to win over those who had been on Brutus' side for the war that was to follow between himself and Octavius? Was it out of gratitude, since Brutus had refused to allow Antony to be killed on the ides of March? Did Antony really believe what he said?