In autumn, the Soviet generals Georgy Zhukov and Aleksandr Vasilevsky, responsible for strategic planning in the Stalingrad area, concentrated forces in the steppes to the north and south of the city. The northern flank was defended by Hungarian and Romanian units, often in open positions on the steppes. The natural line of defence, the Don River, had never been properly established by the German side. The armies in the area were also poorly equipped in terms of anti-tank weapons. The plan was to punch through the overstretched and weakly defended German flanks and surround the German forces in the Stalingrad region.