Mokra is a village in southern Poland. In 1939 it was close to the Polish-German border and it was situated on the main approach route towards Warsaw from the southwest. The German OKH conceived a double envelopment of the Polish Army which was to be carried by two strong Army Groups that were to trap the Polish armies in western Poland. In this pincer movement the southern arm was to be launched from the Silesian-Polish border northeastward and was to join the northern arm east of Warsaw. The German Tenth Army was to carry the main thrust. It struck out in the direction of Warsaw with the largest concentration of armor. Tenth Army’s strongest element was Erich Hoepner’s XVI Armeekorps (mot.).