▁trap ▁H inden burg ▁had ▁planned ▁for ▁them . ▁The ▁German ▁commander ▁had ▁ordered ▁his ▁wings ▁to ▁quick en ▁their ▁march ▁as ▁much ▁as ▁possible , ▁but ▁a ▁trivial ▁accident — a ▁rum or ▁of ▁a ▁Russian ▁counter att ack — cost ▁the ▁Germ ans ▁half ▁a ▁day ' s ▁march , ▁allowing ▁the ▁Rus si ans ▁to ▁escape ▁to ▁the ▁east . ▁These ▁reached ▁G um bin nen ▁the ▁next ▁day , ▁and ▁St all up ön en ▁on ▁the ▁ 1 3 th . ▁The ▁remains ▁of ▁the ▁First ▁Army ▁retre ated ▁to ▁the ▁safety ▁of ▁their ▁own ▁border ▁for ts . ▁Like wise , ▁the ▁T enth ▁Army ▁was ▁forced ▁back ▁into ▁Russia . ▁ ▁German ▁cas ual ties ▁were ▁about ▁ 4 0 , 0 0 0 , ▁Russian ▁ 1 0 0 , 0 0 0 . ▁ ▁Out come ▁▁ ▁This ▁was ▁a ▁strateg ically ▁significant ▁victory ▁for ▁The ▁E ighth ▁Army , ▁completely ▁destroy ing ▁the ▁Second ▁Army , ▁ma uling ▁the ▁First , ▁and ▁e ject ing ▁all ▁Russian ▁troops ▁from ▁German ▁soil . ▁Meanwhile , ▁new ▁German ▁corps ▁( under ▁von ▁der ▁G olt z ) ▁were ▁able ▁to ▁use ▁this ▁movement ▁to ▁safely ▁move ▁into ▁position ▁to ▁har ass ▁the ▁scattered ▁remains ▁of ▁the ▁Second ▁Army , ▁while ▁far ▁to ▁the ▁south west ▁the ▁new ▁German ▁N inth ▁was ▁forming ▁up . ▁It ▁would ▁not ▁be ▁long ▁before ▁they ▁were ▁able ▁to ▁face ▁the ▁Rus si ans ▁in ▁a ▁position ▁of ▁numerical ▁superior