How and why did brutus took advantage of caesar's death

After the assassination of Caesar, one of his friends; Antony succeeds in motivating people to raise revolt against Cassius and Brutus.By the skillful oratory, Antony aroused the anger and hatred of the mob against Brutus, Cassius and other conspirators.Pursed by hostile, furious and bloodthirsty mob, Brutus and Cassius had no option but to run away to save their lives. Their fate was sealed. As they left Rome, Octavius Caesar the nephew of Julius Caesar arrived in Rome to join Antony and have revenge on the conspirators. Ultimately, Brutus and Cassius committed suicide.

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is it rising action, falling action, climax, or resolution? need answer also