What happens to cassius at the end of julius caesar?

  He avenges Caesar and killed himself by running into his own sword.

  After having learned of the death of his allies, Cassius and Titinius, Brutus attempt one last time to battle the Romans commanded by Antony and Octavius but lost.

  During the battle he saw the ghost of Caesar and believed that it was his time to die, so he asked to one of his men to hold his sword while he runs against it to kill himself. He impaled himself and declared that Caesar should himself avenged.

  I hope this answer helps you.

Cassius is slain

Explanation:

Pindarus is resposible for the death of Cassius. It is of importance to mention that Pindarus became a loyal servant to Cassius and when he was ordered to go higher on the hill to inform the news on the field, Cassius is aware of their imminent defeat. Pindarus is unable to disobey his master, even if the order was to kill him. Unwillingly, Pindarus stabs Cassius with the same dagger that "ran through Caesar's bowels". Pindarus becomes a free man for the oath is broken.

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