In Act 5, the two eagles who accompanied the army all the way from Sardis have been replaced by crows and ravens, symbols of bad things to come.
This omen is first seen in Act 1. Cassius speaks of the noble eagles being replaced by kites and ravens, a change considered to be a very bad sign. This superstition leads him to believe that he will lose the battle, and he remarks, "Our army lies ready to give the ghost."
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