When the men went to war in the medieval times how did they prevent their women from being unfaithfull?

Answer 1

In the Western World, chastity belts were used on occasion. In effect, a metal waist band with a metal strap from 'for-to-aft'. Plus lock, with "the man of the house" keeping the key. Hopefully he was not killed in battle. In the Arab World, some women had their vaginas sewn up. Both treatments were unpleasant to say the least; danger of infection, and odiferously obnoxious.

In most cases, they didn't even try. Social convention more than anything else would attempt to keep women from straying, but the truth of the matter was that, with a very high Death Rate for most campaigning soldiers and a more lax attitude towards extended families than we have now, women frequently formed liasons with other available men.

And, who could blame them? Excepting for nobility, most women worked hard in agriculture, and husbands could be expected to possibly be away for years, and many never returned. Women would essentially re-marry after a short period of time, to insure that the household had enough men in it to work the land they had.