What is the Colmar Pocket?

The Colmar Pocket was the area held in central Alsace, France, by the German Nineteenth Army from November 1944 to February 1945, against the U.S. 6th Army Group (6th AG) during World War II. It was formed when 6th Army Group liberated southern and northern Alsace and adjacent eastern Lorraine, but could not clear central Alsace.