Arsenal set down a Community Shield marker for the new season by beating Manchester City 3-0 in Cardiff on Sunday.Mikel Artetas champions resumed where the last Premier League campaign finished in May, holding silverware aloft as the Gunners suggested they remain the team to beat in England.Riccardo Calafiori who took just 24 seconds to become the quickest Community Shield scorer since 1968 Kai Havertz and Martin Odegaard rewarded a dominant Arsenal performance.Although no league points were at stake this was a difficult day for Enzo Maresca in his first competitive game since succeeding Pep Guardiola in the City dugout.City were comfortably second best, new midfielder Elliot Anderson failed to make an impact, and Erling Haaland trudged off early in the second half with the game up.This was the first Community Shield in Cardiff since 2006 when the fixture was held in the Welsh capital for five years with Wembley Stadium being rebuilt. Wembley was this time booked due to a concert.