text:  The An <unk> Rebellion began in December <unk> , and was not completely suppressed for almost eight years . It caused enormous disruption to Chinese society : the census of 754 recorded 52 @.@ 9 million people , but ten years later , the census counted just 16 @.@ 9 million , the remainder having been displaced or killed . During this time , Du Fu led a largely itinerant life <unk> by wars , associated <unk> and imperial <unk> . This period of <unk> was the making of Du Fu as a poet : Even Shan Chou has written that , " What he saw around him — the lives of his family , neighbors , and strangers – what he heard , and what he hoped for or feared from the progress of various campaigns — these became the enduring themes of his poetry " . Even when he learned of the death of his youngest child , he turned to the suffering of others in his poetry instead of dwelling upon his own <unk> . Du Fu wrote : 
  