Answer: Because of the ravens and other scavenger birds which he interprets as bad omens, Cassius believes that his army will lose the battle.
Step-by-step explanation:
Julius Caesar is a play by William Shakespeare. It is a story about power and betrayal, in which a group of conspirators decides to murder Roman general, Caesar.
Cassius is one of the conspirators that participates in the murder plot. In Act 5, the battle between the conspirators and Caesar's supporters is about to begin, and Cassius is deeply frightened. During his conversation with Messala, a friend of Brutus', Cassius confesses that he has a bad feeling about the upcoming battle. As he claims, the two eagles that accompanied the army up to this point have been replaced by the ravens and other scavenger birds, which is a sign of bad luck.