Following its near-destruction at Falaise, the division remained in the German Siegfried Line where it fought several engagements, most notably the Battle of Aachen. Over the next month, it lost over 1,000 men, two-thirds of its combat strength. At the end of September 1944, the 9th Panzer Division was sent into Army Group B's reserve and rehabilitated. It was given 11,000 more replacements and 178 armored vehicles, including 50 Panther tanks. It was to reinforce German units countering Operation Market Garden, but by the time it arrived at Arnhem, the Allied forces had been pushed back. The 9th Panzer Division was returned to the line around Geilenkirchen and Aachen, where it launched a spoiling attack against US forces in the Peel Marshes in November, but only succeeded in losing 30 tanks in the process. It then reassembled west of the Rur River with a strength of 10,000 men, 28 Panther tanks and 14 Panzer IV tanks. Along with elements of the 15th Panzer Grenadier Division, 9th Panzer fought a bitter six-day battle with the U.S. 2nd Armored Division in the Puffendorf-Immendorf sector, knocking out 76 tanks and inflicting 1,300 casualties while suffering 1,100 men and 86 tanks lost. Following this, the division was sent into the OKW reserve. It continued fighting to slow the progress of the U.S. First Army pushing from the west, destroying its 2,325th enemy tank near Geilenkirchen.