▁continu ously ▁successful ▁against ▁T uf an ▁forces ▁over ▁the ▁next ▁few ▁years , ▁re capt uring ▁X i ▁Pref ect ure . ▁ ▁Meanwhile , ▁Wei ▁was ▁continu ously ▁writing ▁to ▁Y im oux un , ▁but ▁Y im oux un ▁did ▁not ▁respond . ▁ ▁Nevertheless , ▁N anz ha o ▁was ▁sending ▁fewer ▁and ▁fewer ▁men ▁to ▁assist ▁T uf an ▁on ▁campaign s . ▁ ▁In ▁ 7 9 1 , ▁Wei ▁made ▁further ▁over t ure ▁to ▁N anz ha o ▁by ▁sending ▁his ▁officer ▁Du an ▁Zh ong yi ▁( 段 忠 義 ), ▁who ▁was ▁originally ▁from ▁N anz ha o ▁and ▁who ▁had ▁served ▁as ▁an ▁em iss ary ▁for ▁Y im oux un ' s ▁grand father ▁Gel u of eng ▁( <0xE9> <0x96> <0xA4> 羅 <0xE9> <0xB3> <0xB3> ), ▁as ▁an ▁em iss ary ▁back ▁to ▁N anz ha o . ▁ ▁( This ▁drew ▁an ▁incident ▁between ▁T uf an ▁and ▁N anz ha o ▁when ▁T uf an ▁found ▁out , ▁forcing ▁Y im oux un ▁to ▁turn ▁someone ▁with ▁a ▁similar ▁profile ▁to ▁Du an ▁to ▁T uf an . ▁ ▁T uf an ▁further ▁react ed ▁by ▁demand ing ▁that ▁N anz ha o ▁officials ' ▁sons ▁be ▁sent ▁to ▁T uf an ▁as ▁host ages ▁to ▁ensure ▁N anz ha o ' s ▁loyal ty , ▁and ▁the ▁N anz ha o ▁people ▁became ▁further ▁res ent ful ▁of ▁T uf an .) ▁ ▁Ar ound ▁this ▁time