▁still ▁holding . ▁During ▁ 2 6 ▁and ▁ 2 7 ▁May , ▁the ▁ 7 th ▁SS ▁Division ▁continued ▁ex ert ing ▁strong ▁pressure ▁on ▁the ▁ 1 st ▁Pro let arian ▁Division ▁in ▁the ▁upper ▁S ana ▁River ▁Valley , ▁but ▁failed ▁to ▁achieve ▁a ▁decis ive ▁break through . ▁By ▁the ▁end ▁of ▁ 2 7 ▁May , ▁the ▁front ▁line ▁had ▁stabil ised ▁to ▁the ▁north ▁and ▁south ▁of ▁Rib nik . ▁After ▁the ▁defeat ▁it ▁had ▁suffered ▁the ▁previous ▁day , ▁the ▁ 3 6 9 th ▁Re con na issance ▁Battalion ▁column ▁did ▁not ▁res ume ▁its ▁advance ▁towards ▁G lam o č ▁on ▁the ▁ 2 6 th . ▁ ▁On ▁ 2 6 ▁May , ▁due ▁to ▁the ▁rapidly ▁changing ▁situation ▁and ▁communic ations ▁difficulties , ▁a ▁degree ▁of ▁confusion ▁emer ged ▁on ▁both ▁sides . ▁Out ▁of ▁contact ▁with ▁their ▁corps ▁headquarters , ▁the ▁ 4 th ▁K raj ina ▁Division ▁continued ▁to ▁retain ▁two ▁brig ades ▁along ▁the ▁Bi ha ć - B os ans ki ▁Pet rov ac ▁road , ▁even ▁though ▁the ▁ 9 2 nd ▁Motor ised ▁Regiment ▁had ▁already ▁passed ▁along ▁this ▁route ▁and ▁into ▁their ▁rear . ▁The ▁crit ically ▁important ▁Bos ans ki ▁Pet rov ac - K l ju č ▁road ▁to ▁the ▁south ▁was ▁left ▁un guard ed , ▁end ang ering ▁T ito ▁and ▁Part isan ▁Supreme ▁Head quarters ▁as ▁they ▁fled ▁from ▁Dr var . ▁ ▁XV ▁Mountain ▁Corps ▁failed ▁to ▁recogn ise