▁resistance ▁from ▁the ▁Part isan ▁ 1 st ▁Pro let arian , ▁ 5 th ▁and ▁ 8 th ▁Corps ▁along ▁their ▁axes ▁of ▁advance , ▁and ▁there ▁was ▁very ▁poor ▁communication ▁and ▁coord ination ▁between ▁the ▁various ▁columns . ▁The ▁ground ▁forces ▁were ▁also ▁subject ed ▁to ▁Al lied ▁air ▁attacks ▁by ▁Air ▁Vice - Mar shal ▁William ▁Elli ot ' s ▁B alk an ▁Air ▁Force ▁throughout ▁the ▁day , ▁called ▁in ▁by ▁the ▁British ▁mission ▁using ▁their ▁surv iving ▁radio . ▁ ▁At ▁ 0 5 : 0 0 ▁on ▁ 2 5 ▁May , ▁ ▁comm enced ▁its ▁attack ▁from ▁S rb ▁in ▁an ▁e aster ly ▁direction , ▁aim ing ▁to ▁cover ▁the ▁ ▁to ▁Dr var ▁as ▁quickly ▁as ▁possible . ▁It ▁encountered ▁organ ised ▁resistance ▁from ▁the ▁ 2 nd ▁L ika ▁Pro let arian ▁Brigade ▁of ▁the ▁ 6 th ▁L ika ▁Pro let arian ▁Division . ▁After ▁a ▁day ' s ▁fighting , ▁the ▁Germ ans ▁had ▁captured ▁Tr ub ar , ▁but ▁were ▁unable ▁to ▁overcome ▁the ▁def ences ▁of ▁the ▁hills ▁east ▁of ▁the ▁village . ▁Rec ogn ising ▁the ▁importance ▁of ▁' s ▁task , ▁the ▁commander ▁of ▁the ▁ 3 7 3 th ▁Division , ▁ ▁Edu ard ▁Ald rian , ▁ordered ▁the ▁batt alion ▁group ▁of ▁the ▁ 3 7 3 th ▁Division ▁to ▁abandon ▁its ▁advance ▁from ▁Lap ac ▁to ▁Martin ▁Bro d ▁and ▁rein force ▁ ▁instead . ▁The ▁remaining ▁brig ade ▁of ▁the ▁ 6 th