 After the decisive victory for Octavian at the Battle of Actium, Cleopatra and Antony withdrew to Alexandria, where Octavian besieged the city until both Antony and Cleopatra committed suicide.The war involved some of the largest Roman armies ever seen.Antony and Octavian’s legions were veterans many having once served with Caesar, though both Antony and Octavian raised their own legions.