I just saw men rowing a modern replica of a Viking ship on the British show "The Worst Jobs in History," and there's no way that they could have brought large horses on one of those.
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They've been finding rune stones in Minnesota from long times past. They've been regarded by most historians as forgeries. There is no proof the Northmen ever lived in North America except for Greenland and The northern tip of Newfoundland at L'Anse aux Meadows, AFAIK.
ETA. Also, the animals the Norse took to Greenland were animals such as cattle, which were used as food. They didn't eat horses.
Major points or issues:
1. the Norse didn't have large horses, anywhere, so couldn't have brought them with them. Medieval horses were relatively small.
2. Even if they had horses they would not have fought on them. They were used as draught animals.
ETA. Also, the animals the Norse took to Greenland were animals such as cattle, which were used as food. They didn't eat horses.
The horse could be carried by an African swallow.
Why are Americans so keen on making remakes of movies? I just don't get it, the original Pathfinder is an amazing movie, certainly the best Norwegian movie ever made.
The American version seems silly and not very historically correct. Yeah, the Vikings had horses, but they were pretty small.
It's plausible that they had (small) horses with them to Vinland/Newfoundland, because they were not explorers, but lost.. They navigated by the stars and was on their way to Greenland from Iceland, but it was, or became, clouded, so they had no clue of where they were going, and thus ended up in Vinland by chance. So much for the viking explorers.
This is all if I remember the Vinland Sagas correctly tho.