Polish planners were well aware that the Red Army was in many elements superior to their own. Therefore, the main idea was to organize a so-called "resistance in motion", and to try to split Soviet forces south and north of the vast Polesie swamps. Frontline armies, in the vicinity of the border, were to try to delay the advance of the aggressors and to bleed them, and reserves, located mostly in the areas of Brześć nad Bugiem and Lublin, intended to enter the conflict in later stages.