Construction, battle in orderly manners and military infrastructure (supply and retreat) is what Roman’s at this point did best. They were usual not good when things became chaotic - but legions were at this point given a lot of autonomy - and Caesar’s troop had a lot of experience. Caesar wanted a lot of slaves/gold - I would think he best chance to win would be to slaughter as many as his south-Gaelic Allie’s and plunder the Roman’s supplies - while some troop keep Caesar occupied

No existing culture are the “first” anywhere - as it is. Besides maybe some very remote islands. The question is more what a native population is.

Other people in the thread talks about trade between Viking and tribes - there are little evidence of that - and they were heavily dependent on cows and European style living in general.

? - they are no more. Current Greenland natives are from a migration wave going through northern Canada. We all come from Africa (at least that’s the consensus)