RAWALPINDI, July 26: Two second half goals by Sher powered fancied Pakistan Army to overpower Karachi Port Trust 2-0 in the National football Challenge Cup at Army Stadium on Tuesday. Sher struck with clinical efficiency for the soldiers in the 56th and 76th minute after a goalless first half that saw both defences making things difficult for the strikers. Pakistan Army now have a strong position in Group II of the preliminary round.—APP