Republican youths in the Nationalist / Republican Ardoyne area of Belfast attack police in an attempt to disrupt a loyalist band marching past their estate during the annual July 12th parades. The yearly marching season often sparks trouble between Protestant and Catholic communities living in close proximity to each other. It is held to commemorate the victory of Protestant king.William III over the Catholic king James in 1690. For.many it remains a focal point in the Protestant.calendar. .