CASHTON, Wis. — A Cashton man was seriously injured when struck by a semi-truck while walking on the shoulder of U.S. Highway 27 about 1-1/2 miles southwest of Cashton. Robert James Giesler, 21, was airlifted 30 miles to a LaCrosse hospital. The accident was about 9:45 p.m. near the Monroe-Vernon county line. Deputies had no idea why Giesler was on foot on the highway so late at night. It was believed he was walking north and suddenly pivoted into the path of the truck, which also was northbound.