| September 11 | Reconnaissance patrol of the 5th Armored Division is the first to cross German border over the River Our. |
| September 12 | 3rd Armored Division begins probes of Scharnhorst Line of the Westwall near Aachen. |
| September 15 | 3rd Armored Division reaches Schill Line near Aachen. |
| September 17 | 12th Infantry Division arrives near Stolberg; first substantial German reinforcements of the campaign. |
| September 17 | Operation Market Garden begins in the late afternoon in the neighboring 21st Army Group sector in the Netherlands. |
| September 22 | Hodges orders temporary halt to offensive operations due to lack of supplies. |
| October 2 | XIX Corps begins drive to breach Westwall north of Aachen. |
| October 8 | VII Corps begins attempt to encircle Aachen and link with XIX Corps to the north. |
| October 10 | US Army issues surrender ultimatum to Aachen garrison. |
| October 11 | Bombardment of Aachen begins. |
| October 13 | Infantry assault into Aachen by 26th Infantry begins. |
| October 16 | Encirclement of Aachen completed at 1615 hours near Ravels Hill. |
| October 21 | German forces in Aachen surrender at 1205 hours. |
| November 2 | US 28th Division begins attack into the Hürtgen forest. |
| November 4 | German counterattack retakes Schmidt. |
| November 6 | US defense of Vossenack falters, but Germans capture only part of town. |
| November 7 | German counterattack retakes Kommerscheidt; 28th Division withdraws from the Kall ravine. |
| November 16 | Operation Queen begins with heavy air bombardment. |
| November 17 | Major counterattack by 9th Panzer Division against advancing 2nd Armored Division. |
| November 20 | Advance by the 4th Infantry Division in the Hürtgen is so slow that V Corps takes over and adds the 8th Infantry Division. |
| November 20 | 2nd Armored Division takes its major objective, Gereonsweiler. |
| November 21 | Eschweiler is captured by the 104th Division. |
| November 28 | The town of Hürtgen finally falls to the 8th Division. |
| November 29 | Grosshau in the Hürtgenwald is finally captured by the 4th Division. |
| November 29 | 84th Division seizes Lindern. |
| December 2 | Brandenberg in the Hürtgenwald is captured by the 5th Armored Division. |
| December 3 | 83rd Division replaces the battered 4th Division in the Hürtgen. |
| December 7 | VII Corps calls a temporary halt to offensive; restarts on December 10. |
| December 16 | Germans launch Operation Wacht am Rhein, the Ardennes offensive. |