There's a lot of material on post 18th century winter warfare and it's generally well understood, but I seem to find almost nothing on winter warfare before the 8th century. How were peope equipped for winter campaigns during Ancient History? I especially think of European civilisations like Rome or Greece that left the comfort of the Mediterranean climate, how did they deal with winter? How did they adapt to it? Did they simply just sit out winter instead of battling against it?