The red circle, the blue circle, and the red triangle. This is definetly not a college level question.
This exchange shows disagreement over military strategy; it recalls the disagreement between Mark Antony and Octavius in act 4 over Lepidus' suitability for a role in the Second Triumvirate. It also foreshadows the future downfall of Rome as a result of their disagreement and hostility.
I hope that helps.