▁orders , ▁crossed ▁into ▁sout he astern ▁Ch ah ar ▁province ▁in ▁the ▁Dol on or ▁region , ▁as ▁a ▁di version ary ▁fe int ▁to ▁draw ▁off ▁Chinese ▁rein for c ements ▁to ▁the ▁Great ▁Wall . ▁ ▁F inding ▁little ▁resistance , ▁Li u ▁then ▁led ▁his ▁ 3 , 0 0 0 ▁troops ▁further ▁east ▁toward ▁Ch ang pe i . ▁Although ▁reported ▁at ▁the ▁time ▁as ▁a ▁Japanese ▁operation , ▁Li u ' s ▁further ▁advance ▁may ▁have ▁been ▁carried ▁out ▁without ▁Japan ' s ▁explicit ▁appro val . ▁ ▁The ▁Ku om int ang ▁military ▁committee ▁in ▁P ek ing ▁appointed ▁General ▁Fu ▁Zu oy i ▁as ▁commander ▁of ▁Chinese ▁ 7 th ▁Army ▁Group , ▁and ▁task ed ▁him ▁with ▁providing ▁Je hol ▁border ▁security . ▁ ▁At ▁the ▁end ▁of ▁April , ▁when ▁the ▁adv ancing ▁Japanese ▁forces ▁approached ▁Mi y un , ▁He ▁Y ing q in ▁anx iously ▁re deploy ed ▁Fu ▁Zu oy i ' s ▁troops ▁to ▁strength en ▁the ▁P ek ing ' s ▁def enses ▁east wards ▁to ▁Ch ang ping ▁leaving ▁the ▁defense ▁of ▁the ▁Ch ah ar ▁border ▁empty . ▁The ▁Japanese ▁and ▁Man ch u ku o ▁arm ies ▁seized ▁the ▁opportunity ▁on ▁May ▁ 1 1 , ▁and ▁quickly ▁following ▁up ▁on ▁Li u ▁Gu it ang ' s ▁advance , ▁seized ▁the ▁Dol onn ur ▁region , ▁and ▁subsequently ▁took ▁Guy uan , ▁just ▁prior ▁to ▁the ▁signing ▁of ▁the ▁Tang gu ▁Tru ce ▁of