O'Reilly and Olbermann fighting Fox/MSNBC proxy war?

Ailes called Zucker on his cellphone last summer, clearly agitated over a slam against him by MSNBC host Keith Olbermann. According to sources familiar with the conversation, Ailes warned that if Olbermann didn’t stop such attacks against Fox, he would unleash O’Reilly against NBC and would use the New York Post as well.