What does Caesar dare Cassius to do at the tiber river?

Answer 1

He dares him to swim in the Tiber River. He says: The troubled Tiber chafing with her shores,

Caesar said to me 'Darest thou, Cassius, now

Leap in with me into this angry flood,

And swim to yonder point?' Upon the word,

Accoutred as I was, I plunged in

And bade him follow;

Answer 2

Caesar dares Cassius to jump into the Tiber River and swim to prove his bravery.