▁advance ▁towards ▁P rij edor ▁and ▁Ban ja ▁Lu ka . ▁ ▁The ▁operation ▁was ▁planned ▁in ▁a ▁matter ▁of ▁hours ▁following ▁a ▁meeting ▁between ▁Cro at ian ▁President ▁Fran jo ▁Tu đ man ▁and ▁U . S . ▁diplom at ▁Richard ▁Hol bro oke , ▁during ▁which ▁Hol bro oke ▁ur ged ▁Tu đ man ▁to ▁se ize ▁P rij edor ▁and ▁threaten ▁to ▁capture ▁Ban ja ▁Lu ka ▁from ▁the ▁V RS , ▁short ▁of ▁actually ▁se izing ▁the ▁city , ▁as ▁he ▁believed ▁such ▁a ▁development ▁would ▁force ▁Bos n ian ▁Ser b ▁leaders ▁to ▁the ▁negoti ating ▁table . ▁In ade qu ate ▁planning ▁and ▁prepar ation , ▁combined ▁with ▁fla wed ▁military ▁intelligence ▁on ▁the ▁def ending ▁force ▁and ▁dis reg ard ▁for ▁the ▁high ▁water ▁level ▁of ▁the ▁Una ▁and ▁S ava ▁rivers , ▁led ▁to ▁a ▁high ▁number ▁of ▁cas ual ties ▁and ▁little ▁success . ▁The ▁off ensive ▁was ▁called ▁off ▁one ▁day ▁after ▁it ▁was ▁launched ▁and ▁the ▁bridge head s ▁were ▁ev acu ated . ▁The ▁H V ▁ultimately ▁bl amed ▁Major ▁General ▁V ink o ▁V r ban ac ▁for ▁its ▁failure . ▁V r ban ac ▁had ▁author ized ▁the ▁off ensive ▁instead ▁of ▁de fer ring ▁to ▁the ▁Chief ▁of ▁the ▁General ▁Staff ▁General ▁Z von imir ▁Č er ven ko . ▁ ▁Operation ▁Una ▁was ▁the ▁only ▁un success ful ▁operation ▁by ▁the ▁H V ▁from ▁a ▁series ▁of ▁off ens ives ▁which ▁had ▁comm enced ▁in ▁November ▁