alling ▁a ▁sea - change ▁in ▁the ▁Pers ian - By z antine ▁relations . ▁ ▁Con clusion ▁▁ ▁After ▁the ▁triumph ▁of ▁Her ac lius , ▁T ong ▁Y ab g hu ▁hast ened ▁to ▁res ume ▁the ▁sie ge ▁of ▁T if lis ▁and ▁successfully ▁storm ed ▁the ▁city ▁in ▁winter . ▁" With ▁their ▁s words ▁raised , ▁they ▁advanced ▁on ▁the ▁walls , ▁and ▁all ▁this ▁mult itude , ▁clim bing ▁upon ▁each ▁other ' s ▁shoulders , ▁rose ▁up ▁the ▁walls . ▁A ▁black ▁shadow ▁fell ▁upon ▁the ▁wob eg one ▁citizens ; ▁they ▁were ▁van qu ished ▁and ▁lost ▁their ▁ground ," ▁Mov s es ▁narr ates . ▁Although ▁the ▁Georg ians ▁surrender ed ▁without ▁further ▁resistance , ▁the ▁city ▁was ▁lo oted ▁and ▁its ▁citizens ▁were ▁mass ac red . ▁The ▁Pers ian ▁governor ▁and ▁the ▁Georg ian ▁prince ▁were ▁tort ured ▁to ▁death ▁in ▁the ▁presence ▁of ▁T ong ▁Y ab g hu . ▁▁ ▁The ▁G ok t ur ks , ▁ren owned ▁for ▁their ▁expert ise ▁in ▁hand - to - hand ▁combat , ▁never ▁excel led ▁in ▁sie ge craft . ▁For ▁this ▁reason ▁G um ile v ▁attributes ▁the ▁taking ▁of ▁T if lis ▁to ▁the ▁Kh az ars . ▁There ▁are ▁good ▁reasons ▁for ▁bel ieving ▁that ▁this ▁success ▁encourag ed ▁T ong ▁Y ab g hu ▁to ▁gr ander ▁designs . ▁This ▁time ▁he ▁planned ▁to ▁incorpor ate ▁Ag h van ia ▁into ▁his ▁k h agan ate ,