The Battle of Elsenborn Ridge was the only sector of the American front lines during the Battle of the Bulge where the Germans failed to advance.[1]:33 The battle centered on the Elsenborn Ridge east of Elsenborn, Belgium in the Ardennes forest. West of Elsenborn Ridge, near the cities of Liège and Spa, Belgium, was a vast array of Allied supplies and the well-developed road network leading to the Meuse River and Antwerp. The Germans planned on using two key rollbahns or routes through the area to seize Antwerp and force a separate peace with the United States and Britain.[2]:259–271 Capturing Monschau and the nearby village of Höfen, and the twin villages of Rocherath-Krinkelt just east of Elsenborn Ridge, were key to the success of the German plans, and Hitler committed his best armored units and infantry troops to the area, including the 12th SS Panzer Division Hitlerjugend.
The green, untested troops of the 99th Infantry Division had been placed in the sector during mid-November because the Allies thought it was an area unlikely to see battle. Their soldiers were stretched thin over a 22-mile (35 km) front, and all three regiments were on line, with no reserve. In early December, the 2nd Infantry Division was assigned to capture a vital crossroads marked by a customs house and a forester’s lodge named Wahlerscheid, at the southern tip of the Hurtgen Forest. They transitioned through the 99th Division's lines and after a deadly, costly battle, captured the crossroads. But the Germans counterattacked in what the Americans initially thought was a localized spoiling action, but was actually a leading element of the Battle of the Bulge. The 2nd Division consolidated their lines, pulling back into Hünningen, and then to the twin villages of Rocherath-Krinkelt, and finally at the dug-in positions held by the 99th Division at Elsenborn Ridge.
In a fierce battle lasting 10 days, the American and German lines were often confused. During the first three days, the battle raged over the twin villages of Rocherath-Krinkelt, during which American G.I.s were at times isolated in individual buildings surrounded by German armor. Attacking Elsenborn Ridge itself, the Germans, although superior in numbers, were stopped by the Americans' well-prepared and deeply dug-in defensive positions. The German attack plans were not well coordinated and frustrated by the rugged terrain, built-up areas around the twin villages, and massed American artillery firepower positioned behind Elsenborn Ridge. American artillery batteries repeatedly pounded the German advance. While the Germans employed an effective combined arms tactic and penetrated the U.S. lines several times, the Americans called in indirect fire on their own positions, pushing the Germans back. U.S. reserve forces consisting of clerks and headquarters personnel were rushed in at one point to reinforce the 395th Infantry Regiment's lines. Although the Germans possessed superior armor, they were held in check by the innovative American tactics, including better communications, coordinated time on target artillery strikes, new proximity fuses for artillery shells, and superior air power.
The Sixth Panzer Army was unable to break through and take its immediate objectives on the Meuse River. The stubborn American resistance forced Kampfgruppe Peiper to choose an alternative route well south of Monschau and Elsenborn Ridge. As a result, the German forces were strung out over miles of winding, single-track roads, unable to concentrate their armored units. Peiper's units were repeatedly stymied by U.S. Army engineers, who blew essential bridges along their route of advance. One column of roughly 40 tanks and support vehicles was destroyed on 17 December when they were discovered by an L4 air observer of the 62nd Armored Field Artillery Battalion, assigned to the 102nd Cavalry Group. They were attacked by the 62nd's 105 howitzers mounted on M7 SP's, Corps 155's and Army 240's.[3]:410–411 The panzers finally reached the Amblève River, only about halfway to the Meuse River, but ran out of fuel. Food and ammunition also ran low. After 10 days, the German forces had been reduced to an ineffective strength and withdrew. The Americans had about 5,000 casualties; while exact German losses are not known, they included significant amounts of armor. While the Americans had considerable supplies and enough troops to re-equip their forces, German losses could not be replaced.