. which meant someone at Wembley Stadium in London Saturday had a rough idea what was going on. But the vast majority of the crowd that attended the first-ever US-style football game to be staged in Britain found the proceedings a mystery. To British eyes, wrote one London sports writer, American football is a high-speed game of pass-the-parcel played by marauding giants. The mere sight of Cardinals' star Art Plunkett bearing down, the reporter said, would be enough to make most people hand the ball over meekly and take up stamp collecting.