11º Ejército
Seeckt proposed that the Eleventh Army should advance north towards Brest-Litovsk, with their flanks shielded by the rivers Vistula and Bug. Mackensen and Falkenhayn supported this strategy of attacking the Russian salient in Poland, and forcing a decisive battle. "Ober Ost", led by Paul von Hindenburg and Erich Ludendorff, would attack towards the southeast, while Mackensen turned north, and the Austro-Hungarian Second Army attacked east.