5 , ▁the ▁ 2 / 1 5 th ▁sa iled ▁from ▁Australia ▁ab o ard ▁the ▁Charles ▁L umm is ▁in ▁early ▁May . ▁ ▁St aging ▁out ▁of ▁Mor ot ai ▁Island , ▁a ▁det achment ▁of ▁the ▁batt alion ▁land ed ▁on ▁Mu ara ▁Island ▁on ▁ 1 0 ▁June ▁ 1 9 4 5 , ▁dis emb ark ing ▁from ▁US - oper ated ▁L V T s ▁and ▁se cur ing ▁the ▁island ▁without ▁opposition , ▁while ▁later , ▁other ▁elements ▁from ▁the ▁ 2 / 1 5 th ▁were ▁put ▁ash ore ▁on ▁the ▁pen ins ula ▁around ▁Br une i ▁Town , ▁as ▁part ▁of ▁Al lied ▁operations ▁to ▁secure ▁northern ▁Bor neo . ▁While ▁the ▁main ▁Australian ▁force ▁advanced ▁towards ▁K uch ing ▁and ▁the ▁oil ▁fields ▁around ▁Ser ia , ▁two ▁companies ▁of ▁the ▁ 2 / 1 5 th ▁served ▁as ▁a ▁" f lo ating ▁reserve " ▁for ▁the ▁ 2 / 1 3 th ▁Battalion ' s ▁landing ▁around ▁L ut ong , ▁while ▁the ▁main ▁body ▁of ▁the ▁ 2 / 1 5 th ▁subsequently ▁moved ▁in land ▁towards ▁Lim b ang , ▁and ▁began ▁pat rolling ▁along ▁the ▁Lim b ang ▁and ▁P and ar uan ▁R ivers ▁that ▁for ked ▁in land ▁from ▁the ▁bay , ▁using ▁landing ▁craft ▁for ▁mob ility , ▁and ▁se cur ing ▁several ▁small ▁villages ▁around ▁the ▁edge ▁of ▁the ▁bay . ▁Lim b ang ▁was ▁taken ▁on ▁ 1 8 ▁June ,