MillerCoors has fired WPP's Cavalry three years after the holding company created the Chicago shop for the sole purpose of servicing Coors brands and new products. The brewer has put Cavalry's brands into an invitation-only review -- including Coors Light, Coors Banquet, Redd's Apple Ale and Smith & Forge Hard Cider -- marking yet another agency shift in the increasingly tumultuous beer market. Full story at AdAge.