 Complete the following phrase:  Most of Luxembourg was rapidly liberated in September 1944 when the front line stabilized behind the Our and Sauer Rivers along the Luxembourg-German frontier. Following the campaign in Brittany, the U.S. VIII Corps occupied the sector of the front line in Luxembourg. On December 16, 1944, elements of the U.S. 28th and 4th Infantry Divisions, as well as a combat command of the 9th Armored Division were defending the line of the Our and Sauer Rivers when the 