http://www.onwar.com/chrono/1942/jul42/f09jul42.htm
Germans after oil in the Caucasus
Thursday, July 9, 1942 www.onwar.com
The oil fields in the Caucasus [photo at link]
From Berlin... The Germans reorganize the command structure of their forces in the south of the Eastern Front. Army South is divided into Army Group A, comprised of 1st Panzer Army, 17th Army and 11th Army under General List and Army Group B, comprised of 4th Panzer Army, 2nd Army and 6th Army under General Bock. This reorganization is designed to expedite the Caucasus offensive. The plan is for Army Group A to advance proceed south through Rostov and capture the oil fields halting on a line from Batumi on the Black Sea to Baku on the Caspian. Army Group B is to advance north of the Don River and establish a protective front for this actions.
From the Eastern Front... German Army Group A begins its attack south to secure the oil fields in the Caucasus. Army Group B reaches Rossosh, cutting the Moscow-Rostov Railway in its advance to provide flank protection for Army Group A.