Thank you for reminding me how much I enjoyed Battlefield. “Just between you and me, Mordred, I'm getting a little tired of hearing about your mother.”

And of course River's “Well then, soldier. How goes the day?” to Eleventy in A Good Man Goes To War is absolutely a conscious and precisely-chosen echo of Morgaine's “A warrior, no less. How goes the day?” to the Brigadier. (Consciously-chosen by River, I mean. Obviously deliberate by Moffat too, but it means in-story as well as out.)