Well, your question is false. Men cannot take away the rights of women. But if the sexes had to go to war with each other, something you are ignoring is that it is impossible to turn economically independent women into chattel unless you also punish the communities, businesses and financial institutions that benefit from female labour and investment. Remove all the women, all their capital, and the system kind of collapses. Or maybe you're thinking of some kind of physical contest. What makes you think it would be a physical contest? That is like, so 1st century. It would probably be a digital one--again, for the money. Whoever has the money has the power, and women would ensure their best programmers and hackers were on the job. Many men would join them too since that is your other false premise--that most men would go along with this.