Yon has had some critical things to say of McChrystal in the past, and this looks like a continuation of that:

McChrystal’s crew has declared an information war on me. No complaints here. McChrystal’s attention is welcome. It indicates that my posts have hit steel further underlines that McChrystal is over his head. If McChrystal knew what he was doing, he would not be drawing attention to his staff. Will provide compelling… evidence in due course. Some of the officers on McChrystal’s staff are my biggest helpers.