You’ve read all of your free items this month. To register, get added benefits and unlimited access to articles, Become a Member. Already a Member? Sign in. Advertising Age Article Abstract Adland's Battle Royale: Agencies Defend Turf As Ad Tech Moves In On Clients Once Allies, Audience-Targeting Firms and Media and Digital Shops Are in Competition for Control and Clients By Alexandra Bruell and Tim Peterson, Published on October 13, 2013 0 Want more Access, Content & Connections? Upgrade to Membership. We are glad you are enjoying Advertising Age. To get uninterrupted access and additional benefits, become a member today. Become a Member Already a member? Log in.