On 31 December 1944, German Army Group G—commanded by Generaloberst Johannes Blaskowitz—and Army Group Oberrhein ("Upper Rhein")—commanded by Reichsführer-SS Heinrich Himmler—launched a major offensive against the thinly stretched, 110-kilometre-long (68 mi) front line held by the U.S. 7th Army. Operation Nordwind soon had the understrength U.S. 7th Army in dire straits. The 7th Army—at the orders of U.S. General Dwight D. Eisenhower—had sent troops, equipment, and supplies north to reinforce the American armies in the Ardennes involved in the Battle of the Bulge.