What about the horses?

Hi Pete. Regarding the specific mention and description of large horse-mounted armies in Ezekial 38:3-4, 15, and in Revelation 14:20, I'm wondering if (before Gog/Magog) some kind of catastrophic event/s will occur that render modern weaponry and technology unusable, thereby forcing militaries to resort to building up huge cavalries. I'm also wondering about the time it would take to build and train such a force. Any thoughts? Thank you