▁set ▁of ▁major ▁land ings ▁occurred ▁along ▁the ▁shore ▁of ▁Lam on ▁Bay ▁in ▁southern ▁Lu zon . ▁With ▁the ▁withdraw al ▁from ▁Clark ▁Field ▁on ▁ 2 0 ▁December , ▁the ▁ 2 4 th ▁used ▁dispers ed ▁landing ▁fields ▁on ▁Lu zon , ▁some ▁little ▁more ▁than ▁grass ▁to ▁carry ▁on ▁the ▁fight . ▁Japanese ▁forces ▁were ▁rapidly ▁adv ancing ▁from ▁both ▁the ▁north ▁and ▁south . ▁Mac Ar thur ▁ordered ▁all ▁American ▁and ▁Philipp ine ▁forces ▁to ▁withdraw ▁to ▁the ▁B ata an ▁Pen ins ula ▁and ▁all ▁F E AF ▁aircraft ▁to ▁withdraw ▁from ▁Clark ▁and ▁Nich ols ▁Field s . ▁ ▁Field ▁order ▁No . ▁ 4 , ▁H Q ▁Philippines ▁Department ▁on ▁ 1 0 ▁January ▁ 1 9 4 2 ▁appointed ▁the ▁ground ▁e ch el ons ▁of ▁the ▁ 2 4 th ▁P urs uit ▁Group ▁as ▁the ▁ 2 d ▁Infantry ▁Regiment ▁( Pro vis ional ) ▁of ▁the ▁ 7 1 st ▁Division . ▁ ▁The ▁unit ▁was ▁ordered ▁to ▁establish ▁def enses ▁on ▁the ▁beach ▁of ▁the ▁pen ins ula . ▁ ▁The ▁ground ▁e ch el on ▁of ▁the ▁ 3 d ▁P urs uit ▁Squadron ▁was ▁moved ▁from ▁Nich ols ▁Field ▁to ▁Or g ani , ▁then ▁to ▁the ▁mouth ▁of ▁the ▁Tal an ▁River ▁where ▁the ▁men ▁took ▁up ▁a ▁position ▁as ▁ground ▁troops ▁on ▁beach ▁defense . ▁ ▁The ▁ground ▁e ch el on ▁of ▁the ▁ 2 0 th ▁P urs uit ▁Squadron , ▁was ▁moved ▁to