 Complete the following phrase:  The division entered combat on 18 November with an attack on Geilenkirchen, Germany, Operation Clipper as part of the larger offensive in the Roer Valley, north of Aachen. Operating under the command of Lt-Gen Brian Horrocks the division was supported by British tanks of the Sherwood Rangers Yeomanry, specialist armoured units of 79th Armoured Division, and XXX Corps artillery. Taking Geilenkirchen on 19 November, the division pushed forward to take Beeck Geilenkirchen and Lindern Geilenkirchen in the face of heavy enemy resistance, 29 November. After a short rest, the division returned to the fight, taking Wurm and Würm Geilenkirchen, Mullendorf, 18 December, before moving to Belgium to help stem the German winter offensive 