▁On ▁August ▁ 2 7 , ▁the ▁Pol es ▁officially ▁demanded ▁that ▁Lith u ani ans ▁retre at ▁behind ▁the ▁F och ▁Line . ▁On ▁September ▁ 1 , ▁Rud nick i ▁announced ▁incorpor ation ▁of ▁P MO ▁volunte ers ▁into ▁the ▁ 4 1 st ▁Infantry ▁Regiment . ▁During ▁the ▁negoti ations ▁on ▁September ▁ 5 , ▁represent atives ▁of ▁the ▁two ▁groups ▁agreed ▁to ▁sett le ▁on ▁a ▁detailed ▁dem arc ation ▁line ; ▁Lith u ani ans ▁agreed ▁to ▁retre at ▁by ▁September ▁ 7 . ▁The ▁Polish ▁regular ▁army ▁units ▁did ▁not ▁cross ▁the ▁F och ▁Line , ▁and ▁refused ▁to ▁aid ▁the ▁P MO ▁ins urg ents ▁still ▁operating ▁on ▁the ▁Lith uan ian ▁side . ▁ ▁Polish ▁sources ▁give ▁total ▁Polish ▁cas ual ties ▁for ▁the ▁Se j ny ▁U pr ising ▁as ▁ 3 7 ▁killed ▁in ▁action ▁and ▁ 7 0 ▁wounded . ▁ ▁After math ▁ ▁After ▁the ▁u pr ising , ▁Poland ▁repr essed ▁Lith uan ian ▁cultural ▁life ▁in ▁Se j ny . ▁Lith uan ian ▁schools ▁in ▁Se j ny ▁( which ▁had ▁some ▁ 3 0 0 ▁pup ils ) ▁and ▁surrounding ▁villages ▁were ▁closed . ▁The ▁local ▁Lith uan ian ▁cler gy ▁were ▁ev icted , ▁and ▁the ▁Se j ny ▁Pri est ▁Sem inary ▁re located . ▁According ▁to ▁the ▁Lith u ani ans , ▁the ▁repr essions ▁were ▁even ▁more ▁far - re aching , ▁including ▁a ▁ban ▁on ▁public ▁use ▁of ▁the ▁Lith uan ian ▁language