▁Herz egov ina ▁became ▁part ▁of ▁the ▁V RS , ▁and ▁the ▁J NA ▁ 2 nd ▁Oper ational ▁Group ▁was ▁renamed ▁as ▁the ▁ 4 th ▁V RS ▁Herz egov ina ▁Corps . ▁Cro atia ▁saw ▁the ▁J NA ▁moves ▁as ▁a ▁pre l ude ▁to ▁attacks ▁on ▁southern ▁Cro atia ▁specifically ▁aim ed ▁at ▁the ▁Port ▁of ▁P lo če ▁and ▁possibly ▁Split . ▁To ▁counter ▁the ▁threat , ▁the ▁H V ▁appointed ▁General ▁J ank o ▁Bob et ko ▁to ▁command ▁the ▁Southern ▁Front , ▁en comp ass ing ▁the ▁Herz egov ina ▁and ▁Dub rov nik ▁areas . ▁Bob et ko ▁re organ ized ▁the ▁H VO ▁command ▁structure ▁and ▁assumed ▁command ▁of ▁the ▁H VO ▁in ▁the ▁region ▁and ▁newly ▁deployed ▁H V ▁units , ▁the ▁ 1 st ▁Gu ards ▁and ▁the ▁ 4 th ▁Gu ards ▁Brig ades . ▁ ▁The ▁V RS ▁and ▁J NA ▁attacked ▁north ▁of ▁St on ▁on ▁ 1 1 ▁April , ▁pushing ▁back ▁elements ▁of ▁the ▁H V ▁ 1 1 5 th ▁Infantry ▁Brigade ▁and ▁elements ▁of ▁the ▁arriv ing ▁H V ▁Gu ards ▁Brig ades ▁for ▁only ▁mod est ▁territorial ▁gain . ▁The ▁front line ▁stabil ized ▁by ▁ 2 3 ▁April ▁and ▁the ▁H V ▁counter att ack ed ▁and ▁rec laimed ▁some ▁ground ▁after ▁ 2 7 ▁April . ▁On ▁ 1 7 ▁May , ▁Bob et ko ▁ordered ▁a ▁major ▁attack ▁of ▁the ▁two ▁full ▁gu ards ▁brig ades . ▁The ▁ 1 st ▁Gu