http://www.history.army.mil/books/wwii/70-42/70-422.htm "Casualties mounted when the Rangers served as line infantry in the offensive against the German Winter Line. Lacking troops on the Venafro front, General Mark Clark used the Rangers to fill gaps in Fifth Army's line from early November to mid-December. Attached to divisions, the battalions engaged in bitter mountain fighting at close quarters. Although reinforced by a cannon company of four 75-mm. guns on half-tracks, they still lacked the firepower and manpower for protracted combat. By mid-December the continuous fighting and the cold, wet weather had taken a heavy toll. In one month of action, for example, the 1st Ranger Battalion lost 350 men, including nearly 200 casualties from exposure. Moreover, the quality of the battalions declined as veterans were replaced by enthusiastic, but inadequately trained, replacements"