If I remember right, the Mongols actually invaded (and defeated) Russia during the winter (and the 1241 invasion of Poland was definitely in the winter), so either it wasn't a problem or any increased fragility was offset by other advantages. (And they may have been fairly light winters, too.)
Which seems odd, in a way, since you'd think the various materials (horn, wood, sinew, glue) in Mongol bows would respond to temperature differently. Huh.
Cheers,
James
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