With the initial operations being very successful, the Germans decided that their summer campaign in 1942 would be directed at the southern parts of the Soviet Union. The initial objectives in the region around Stalingrad were to destroy the industrial capacity of the city and to block the Volga River traffic connecting the Caucasus and Caspian Sea to central Russia. The Germans cut the pipeline from the oilfields when they captured Rostov on 23 July. The capture of Stalingrad would make the delivery of Lend Lease supplies via the Persian Corridor much more difficult.