https://www.youtube.com/watch?v=LWVPp0uhtu0

A great video of what you'd be up against only you can't even fight back. I'll also point out that the Haradrim were some of the best Desert fighters and Asymmetrical and Guerrilla fighters in the books. PLus the Mumakill who was also considered one of the strongest weapons the evil side had besides the Nazgul. Now also imagine that for the entire journey to your location.