. ▁ ▁No ▁Chinese ▁sett lers ▁were ▁to ▁be ▁permitted ▁to ▁re loc ate ▁to ▁northern ▁part ▁of ▁Ch ah ar , ▁and ▁the ▁activities ▁of ▁the ▁Ku om int ang ▁were ▁b anned , ▁as ▁were ▁all ▁other ▁anti - J apan ese ▁institutions . ▁In ▁August ▁ 1 9 3 5 , ▁General ▁Min ami ▁met ▁with ▁Prince ▁Dem ch ug d ong r ub ▁where ▁the ▁Prince ▁promised ▁close ▁co operation ▁with ▁Japan , ▁and ▁Min ami ▁promised ▁financial ▁assistance . ▁ ▁On ▁December ▁ 2 4 , ▁ 1 9 3 5 , ▁General ▁Min ami ▁sent ▁two ▁batt al ions ▁of ▁irregular ▁Man ch ur ian ▁caval ry ▁under ▁Li ▁Sh ou - h sin , ▁a ▁squad ron ▁of ▁Japanese ▁plan es , ▁and ▁a ▁few ▁t anks ▁to ▁assist ▁Prince ▁Dem ch ug d ong r ub ▁in ▁occup ying ▁the ▁northern ▁part ▁of ▁Ch ah ar ▁province . ▁The ▁six ▁h s ien ' s ▁of ▁northern ▁Ch ah ar , ▁were ▁def ended ▁by ▁only ▁a ▁few ▁thousand ▁men ▁of ▁the ▁Peace ▁Pres ervation ▁Corps . ▁ ▁With ▁Li ' s ▁assistance ▁the ▁Inner ▁Mong ol ian ▁forces ▁soon ▁over ran ▁the ▁area . ▁ ▁S ui y uan ▁Camp aign ▁ 1 9 3 6 – 1 9 3 7 ▁ ▁Japanese ▁Pre par ations ▁ ▁For ▁some ▁time ▁before ▁the ▁capture ▁of ▁northern ▁Ch ah ar , ▁Japanese ▁secret ▁agents ▁had ▁been ▁operating ▁in ▁S ui y uan , ▁setting ▁up ▁radio