▁Zu oy i ▁prepared ▁for ▁the ▁expected ▁Japanese - Inner ▁Mong ol ian ▁assault ▁by ▁seeking ▁rein for c ements ▁for ▁his ▁provincial ▁forces ▁from ▁the ▁governor ▁of ▁Sh an xi ▁province ▁Yan ▁X ish an , ▁as ▁well ▁as ▁Chi ang ▁K ai - she k , ▁who ▁had ▁moved ▁his ▁Central ▁Army ▁forces ▁into ▁Sh a an xi ▁province ▁to ▁attack ▁Chinese ▁Red ▁Army ▁units ▁arriv ing ▁there ▁after ▁the ▁Long ▁March . ▁ ▁On ▁August ▁ 9 , ▁Yan ▁sent ▁the ▁Chinese ▁ 1 9 th ▁Army ▁under ▁Wang ▁J ing gu o ▁consisting ▁of ▁the ▁ 6 8 th ▁Division , ▁ 7 th ▁and ▁ 8 th ▁Independent ▁Brig ades ▁and ▁four ▁art illery ▁reg iments , ▁and ▁on ▁September ▁ 1 8 , ▁the ▁Central ▁Army ▁sent ▁one ▁anti - air craft ▁art illery ▁batt alion . ▁ ▁On ▁October ▁ 1 4 , ▁Chi ang ▁K ai - she k ▁sent ▁a ▁tele gram ▁to ▁Yan ▁X ish an , ▁advis ing ▁that ▁he ▁was ▁sending ▁Tang ▁En bo ▁and ▁the ▁Chinese ▁ 1 3 th ▁Army ▁( with ▁ 2 ▁divisions ) ▁and ▁Men ▁B ing y ue ' s ▁ 7 th ▁Caval ry ▁Division ▁to ▁rein force ▁S ui y uan . ▁On ▁October ▁ 3 0 , ▁Yan ▁X ish an ▁and ▁Fu ▁Zu oy i ▁met ▁with ▁Chi ang ▁K ai - she k , ▁to ▁assess ▁the ▁military ▁situation ▁and ▁determine ▁tro op ▁dispos itions . ▁On ▁November ▁ 1