From the start, the deployed tactical fighters and bombers to Japan and South Korea were effective. On 10 July a North Korean armored column was trapped at a bombed-out bridge near Pyongtaek. F-80 Shooting Stars, B-26 Invaders, and F-82 Twin Mustangs destroyed 117 trucks, 38 tanks, and seven half-tracks. This attack, along with others, gutted North Korea's single armored division. Had it survived, the North Korean force could have easily punched through the United Nations (UN) defensive line at Pusan and driven UN Command (UNC) forces into the sea.