▁A ▁small ▁det achment ▁was ▁quickly ▁sent ▁north ▁to ▁capture ▁La o ag , ▁capital ▁of ▁I loc os ▁Norte ▁Province , ▁fifty ▁miles ▁away , ▁along ▁with ▁its ▁air field . ▁ ▁With ▁the ▁Americans ▁on ▁the ▁run , ▁Hom ma ▁decided ▁to ▁leave ▁only ▁a ▁small ▁g arrison ▁at ▁V igan , ▁and ▁to ▁move ▁the ▁bulk ▁of ▁his ▁combat ▁forces ▁to ▁south ▁to ▁assist ▁the ▁Japanese ▁landing ▁force ▁at ▁L ing ay en ▁G ulf . ▁ ▁By ▁ 1 3 0 0 ▁on ▁ 2 0 ▁December ▁the ▁Tan aka ▁Det achment ▁from ▁A par ri ▁and ▁K anno ▁Det ach ments ▁had ▁joined ▁together ▁as ▁a ▁single ▁regiment , ▁and ▁march ed ▁out ▁of ▁V igan ▁south ▁along ▁coast al ▁Route ▁ 3 . ▁Rep air ing ▁destroyed ▁brid ges ▁along ▁the ▁way , ▁the ▁Japanese ▁reached ▁the ▁town ▁of ▁reached ▁Bac not an ▁by ▁the ▁evening ▁of ▁ 2 1 ▁December . ▁Bac not an ▁was ▁def ended ▁by ▁elements ▁of ▁the ▁Philipp ine ▁ 1 1 th ▁Division , ▁but ▁the ▁Japanese ▁made ▁a ▁fl ank ing ▁movement ▁to ▁the ▁east ▁and ▁forced ▁part ▁of ▁the ▁def enders ▁back , ▁while ▁cutting ▁off ▁rein for c ements ▁from ▁the ▁mountains ▁to ▁the ▁east . ▁The ▁Japanese ▁reached ▁San ▁Fernando , ▁La ▁Union , ▁on ▁the ▁morning ▁of ▁the ▁ 2 2 ▁December , ▁only ▁a ▁few ▁hours ▁after ▁the ▁main ▁elements ▁of ▁the ▁I J A ▁ 1 4 th ▁Army ▁began ▁the ▁Japanese ▁invasion ▁of