▁resistance ▁from ▁the ▁ 6 th ▁K raj ina ▁Brigade ▁of ▁the ▁ 4 th ▁K raj ina ▁Division . ▁By ▁the ▁end ▁of ▁the ▁day , ▁the ▁western ▁column ▁had ▁reached ▁V r to če , ▁half way ▁between ▁Bi ha ć ▁and ▁Bos ans ki ▁Pet rov ac . ▁Being ▁fully ▁motor ised , ▁it ▁used ▁its ▁mob ility ▁to ▁out man oe uv re ▁the ▁Part is ans , ▁by pass ing ▁their ▁main ▁def ensive ▁positions ▁to ▁the ▁west , ▁with ▁the ▁C oss ack ▁pione ers ▁playing ▁an ▁important ▁role ▁in ▁keeping ▁the ▁column ▁moving . ▁The ▁eastern ▁column ▁started ▁its ▁advance ▁from ▁Bos anska ▁Kru pa , ▁aim ing ▁to ▁establish ▁contact ▁with ▁the ▁western ▁column ▁at ▁V r to če . ▁It ▁advanced ▁ 1 0   km ▁before ▁being ▁held ▁up ▁by ▁the ▁def ences ▁of ▁the ▁ 8 th ▁K raj ina ▁Brigade ▁of ▁the ▁ 4 th ▁K raj ina ▁Division . ▁ ▁The ▁forces ▁commanded ▁by ▁the ▁ 7 th ▁SS ▁Division ▁were ▁organ ised ▁into ▁northern , ▁central ▁and ▁southern ▁columns . ▁The ▁northern ▁column ▁consisted ▁of ▁ ▁and ▁included ▁a ▁company ▁of ▁t anks . ▁It ▁moved ▁swift ly ▁south west ▁from ▁its ▁start ▁point ▁near ▁Ban ja ▁Lu ka , ▁and ▁had ▁reached ▁Č a đ av ica ▁( at ▁a ▁cross ro ads ▁half way ▁between ▁Mr kon ji ć ▁Grad ▁and ▁Kl ju č ) ▁by ▁the ▁evening ▁of ▁ 2 5 ▁May , ▁br ushing ▁off