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13.3* Read these sentences about Julius Caesar. Then complete the sentence with the past simple or past perfect form of the verb in brackets:

Julius Caesar 1) (come) came from an aristocratic Roman family, though his family was not rich by Roman standards. When he was 15 his father 2) (die) _______, and to avoid political problems in Rome, Caesar 3) (serve) _______ as a soldier in the east. By the time he 4) (return) _______ to Rome, he 5) (win) _______ awards for bravery. He 6) (become) _______ a member of the Senate, and governor of what is now Spain. By the age of 40 he 7) (rise) _______ to the top of the political world, and 8) (form) _______ a political alliance with a powerful general, Pompey, and a rich man, Crassus. Between 58 BC and 49 BC he 9) (fight) _______ a war against the people of what are now France, Belgium, Switzerland and parts of Germany. By the end of this war, according to the historian Plutarch, three million men 10) (die) _______. In 50 BC the Senate 11) (order) _______ Caesar to return to Rome. By that time, Crassus was dead and Pompey 12) (become) _______ Caesar's enemy. In the civil war that followed, Caesar 13) (defeat) _______ all his enemies. By the time a group of Roman senators 14) (murder) _______ him in 44 BC, he 15) (be) _______ the most powerful man in Rome for only a year.

возможно вы правы и здесь уместен past perfect. When he was 15 his father died я рассматривал как отдельную часть предложения, и так как не сказано когда именно Цезарь пошел служить, а пошел чтобы избежать политических проблем. Поэтому нет законченного действия до какого-либо события.Такая была логика. When his father died, Caesar had served as a soldier in the east. В этом случае точно past perfect, в вашем случае надо перепроверить.

died, served,  returned, won, became, rised formed, fought, died, ordered, had become defeated, murdered, was.