More accurately called the "Ardennes Offensive" that started Dec. 16 1944 was the worst U.S. Intelligence disaster in history up to that time. American Troops were singing Christmas Carols and counting on being home for Christmas. Ike was attending a series of (booze filled?) Christmas parties while Troops in the security rest area could hear machinery and rumbles and indications of something past the German lines. Ike should have been relieved of duty for his negligence when German tanks broke through the Allied lines.