U.S Bomb Bursts Cover Bridge ***** Italy Clouds of smoke cover the Piacenza railroad bridge after medium bombers of the 12th U.S Army air force had struck this vital target in northern Italy. Part of the Mediterranean Allied air force, the 12th is lending tactical support to Allied ground force fighting in the rough terrain before the broad Po Valley. Now supporting allied land force pushing the Germans back toward the ***** Alps, its pilots are also veterans of the campaigns in North Africa and Sicily. December 13, 1944. (Photo by U.S. Office of War Information Picture).