▁in ▁April ▁ 1 9 4 7 , ▁which ▁the ▁AF P FL ▁won ▁convin cing ly ▁amid st ▁an ▁opposition ▁boy c ott , ▁taking ▁ 1 7 3 ▁of ▁the ▁ 2 1 0 ▁seats ▁and ▁running ▁uno pp osed ▁in ▁over ▁fifty ▁constitu encies . ▁A ung ▁San ▁was ▁set ▁to ▁become ▁Prime ▁Minister , ▁but ▁was ▁assass in ated ▁together ▁with ▁six ▁other ▁members ▁of ▁his ▁cabinet ▁on ▁ 1 9 ▁July , ▁a ▁date ▁that ▁later ▁became ▁Mart y rs ' ▁Day . ▁In ▁his ▁place , ▁U ▁Nu ▁then ▁became ▁both ▁the ▁Premier ▁of ▁Bur ma ▁and ▁leader ▁of ▁the ▁AF P FL . ▁ ▁Independ ence ▁and ▁civil ▁war ▁Bur ma ▁declared ▁independence ▁from ▁Britain ▁in ▁January ▁ 1 9 4 8 , ▁and ▁the ▁CP B ▁went ▁under ground ▁the ▁following ▁March ▁after ▁U ▁Nu ▁ordered ▁the ▁arrest ▁of ▁its ▁leaders ▁for ▁inc iting ▁re bell ion . ▁ ▁Other ▁groups ▁also ▁soon ▁dropped ▁out ▁of ▁the ▁AF P FL ▁to ▁join ▁the ▁re bell ion , ▁not ▁only ▁the ▁White - band ▁fa ction ▁of ▁the ▁People ' s ▁Vol unte er ▁Organisation ▁( P VO ) ▁formed ▁by ▁A ung ▁San ▁as ▁a ▁par amil it ary ▁force ▁out ▁of ▁the ▁dem ob bed ▁veter ans , ▁but ▁also ▁a ▁large ▁part ▁of ▁the ▁Bur ma ▁R if les ▁led ▁by ▁commun ist ▁command ers ▁calling ▁themselves ▁the ▁Revolution ary ▁Bur ma ▁Army ▁( R BA ). ▁The ▁AF P FL ▁government ▁had