Indeed, even a cursory reading of the war chapters in the Book of Mormon reveals that the battles there are quite foreign to anything a farm boy in New York would have experienced. The accuracy of realistic detail, problems with logistics, rebellion, prisoners of war, morale, spies, etc., reflect authorship by someone intimately familiar with real ancient battle. Accurately describing ancient fortifications in Mesoamerica is just one tiny part of the military mosaic that reflects ancient authorship of the Book of Mormon. And again, recall that the whole idea of significant warfare in ancient Mesoamerica was dismissed by the experts until about 20 years ago. As always, the more we dig into the Book of Mormon, the stronger it becomes.
Time continues to erode rather than fortify the many attacks against it.