<prompt> Translate the following text to EnglishNapoleon alipata ushindi mkubwa, lakini mshirika wake Poniatowski alikataa kujisalimisha, akipendelea kujitoa mwenyewe na majeshi yake.  <response>: Napoleon suffered a great defeat, but his ally Poniatowski refused to surrender, preferring to sacrifice himself and his troops. 