u ania ▁on ▁June ▁ 1 8 , ▁ 1 9 1 9 . ▁The ▁line ▁satisfied ▁no ▁one , ▁and ▁Polish ▁troops ▁continued ▁to ▁advance ▁deeper ▁into ▁the ▁Lith uan ian - control led ▁territory . ▁These ▁attacks ▁coinc ided ▁with ▁the ▁signing ▁of ▁the ▁Tre aty ▁of ▁Vers a illes ▁on ▁June ▁ 2 8 , ▁which ▁elimin ated ▁any ▁danger ▁from ▁Germany . ▁Att empt ing ▁to ▁halt ▁further ▁host ilities , ▁Marsh al ▁of ▁France ▁Ferdinand ▁F och ▁proposed ▁a ▁new ▁line , ▁known ▁as ▁the ▁F och ▁Line , ▁on ▁July ▁ 1 8 , ▁ 1 9 1 9 . ▁ ▁The ▁F och ▁Line ▁was ▁negoti ated ▁with ▁the ▁Polish ▁war ▁mission , ▁led ▁by ▁General ▁T ade usz ▁Jordan - R oz w adow ski ▁in ▁Paris , ▁while ▁Lith uan ian ▁represent atives ▁were ▁not ▁invited . ▁The ▁F och ▁Line ▁had ▁two ▁major ▁modifications ▁compared ▁to ▁the ▁June ▁ 1 8 ▁line : ▁first , ▁the ▁entire ▁line ▁was ▁moved ▁west ▁to ▁give ▁extra ▁protection ▁to ▁the ▁strateg ic ▁Wars aw ▁– ▁Saint ▁Petersburg ▁Railway ▁and ▁second , ▁the ▁Su w ał ki ▁Region , ▁including ▁the ▁towns ▁of ▁Se j ny , ▁Su w ał ki , ▁Pu ń sk , ▁was ▁assigned ▁to ▁Poland . ▁Despite ▁ass ur ances ▁at ▁the ▁time ▁that ▁the ▁line ▁was ▁just ▁a ▁temporary ▁measure ▁to ▁normal ize ▁the ▁situation ▁before ▁full ▁negoti ations ▁could ▁take ▁place , ▁the ▁southern ▁F och ▁Line ▁is ▁the ▁present