There's quite a lot, too, and more found each year. For that matter, about ten years ago, a "rescue" dig in Copenhagen Denmark in a suspected old site turned up a Roman cemetery. Roman settlement, rule, trade, and influence was spread quite a bit farther east and north than has been the drumbeat for generations. There was no "Battle That Stopped Rome" -- when the Romans quit, they did so because of diminishing returns (IOW, there was nothing worth the cost of conquest, or, there were much richer pickings elsewhere all of a sudden).
“...when the Romans quit, they did so because of diminishing returns (IOW, there was nothing worth the cost of conquest, or, there were much richer pickings elsewhere all of a sudden).”
How about this for a limiting factor - they stopped when they didn’t find any more natural warm mineral springs where they could indulge in the Roman bath experience? This observation could apply to Germany and England. I suppose if they ever heard of Iceland’s warm springs, they would have launched boats and tried to run off the Vikings and their descendants.