Roman battlefield found deep inside Germany

[Epictetus]

Is there *evidence* for the practice of Romans "policing" a battlefield for dropped items or spent weapons, or is that a modern assumption?

There is some evidence that I thought of, although it is from a much earlier period (and deals not just with Romans, but also with other pre-Roman Italic peoples.) Try Bietti Sestieri's The Iron-Age Community of Osteria dell'Osa.

I remember some good quotes about this. Unfortunately time is tight around Christmas, but I will try to dig them up if you like.