The two Vegetii

[Flavivs Aetivs]

"But of the sarmatians, whose horsemen were strong at (in?) many ages, discovered the use, in order that the animal might be covered down from the neck to the feet placed under a cloak and adding live coals smoked the (castoreus?) from under, in order that the smoke heated whole stomach and testicles of his (Castorei?); and immediately having pulled the buried coals they (the horses?) were walked down and were watered."

Crap it's been a while since I've actually had to translate something. This was the best I could do