Aachen was a part of the Westwall. The city nestled within two belts of bunkers and obstacles, one to the west of the city and the other to the east. The Aachen sector was, in fact, one of the most heavily fortified portions of the Westwall. Aachen itself, however, was unfortified. It had little to commend it as a battleground from either the German or the American perspective. As a defensive position, Aachen was flawed by the fact that it lay in a depression with higher ground on all sides. From the American point of view, Aachen offered little as an objective. The existing road net made it perfectly feasible to bypass the urban area altogether. Although Aachen was home to some industry and coal mining, it was not vital to the German war effort. Moreover, heavy Allied air raids had already damaged or destroyed half of its buildings. In light of what eventually occurred, it seems ironic that on the day VII Corps entered Germany, the Americans intended to bypass Aachen, and the German commander within Aachen intended, apparently, to yield the city without a fight.
Adolf Hitler had other ideas. He had no intention of yielding a German city to the enemy.
Fortunately for the Americans, the defense of downtown Aachen was also a secondary priority for the Germans, who were more concerned with eliminating the penetrations of the Westwall north and south of town. The garrison of Aachen proper consisted primarily of the 246th Volksgrenadier Division, minus 4 of its 7 infantry battalions. Volksgrenadier divisions, which first appeared in the German order of battle in the autumn of 1944, were hastily constituted formations composed largely of survivors from other divisions wrecked in battle. These divisions lacked a full complement of artillery, but were abundantly provided with automatic weapons as compensation. The commander of the 246th Volksgrenadier was Colonel Gerhard Wilck. To support his infantry, Wilck had five Panzer IV medium tanks armed with high-velocity 75mm guns, and some artillery pieces ranging in caliber from 75mm to 150mm. Perhaps the most dangerous weapons in Wilck's arsenal were panzerfausts.
Wilck assumed command in Aachen on 12 October, one day before the American assault on the city began. He established his headquarters in the luxurious Hotel Quellenhof, located in the resort district on the north side of town. Yet, his force numbered only some 5,000 troops of uneven quality, exclusive of reinforcements that would become available during the fight.
ALTHOUGH HE DID NOT KNOW IT, WILCK'S FORCE OUTNUMBERED BY A RATIO OF THREE OR FOUR TO ONE THE AMERICANS WHO WOULD LAUNCH THE ATTACK ON AACHEN (emph Mine). Moreover, the two battalions of the 1st Infantry Division given the task of reducing Aachen had no experience in urban operations. At best, they had received word-of-mouth accounts of urban fighting conducted by other units, and that news was far from reassuring.
The closest that the relevant field manuals came to an urban operations doctrine was a few pages on fighting in towns and villages. They recommended enveloping the town, or avoiding it altogether.
One might argue that the Army's published doctrine was sound in general principle, but clearly the American troops assaulting Aachen would have to work out the details for themselves. One factor working in the Americans' favor was that the force given the mission was among the most experienced units in the U.S. Army. The 1st Infantry Division's 26th Infantry Regiment, commanded by Colonel John F.R. Seitz, had been in action since the invasion of North Africa in November 1942. Two of the regiment's three battalions were available for the reduction of Aachen--the 2nd, commanded by Lieutenant Colonel Derrill M. Daniel, and the 3rd, under Lieutenant Colonel John T. Corley. Expecting that the German defenses in Aachen would be oriented to the south, where American forces had been in position for a month, the commander of the 1st Infantry Division, Major General Clarence R. Huebner, directed the two assault battalions to swing around to the east and attack the city along an east-west axis. The 1106th Engineer Combat Group, consisting of two battalions, received the mission of holding the perimeter on the southern side of Aachen while the attack crossed its front.