Unfortunately that one doesn't help me - since it's not Gettysburg, Antietam, Shiloh, etc. any mistakes aren't as readily apparent. There have been quite a few threads on the forum featuring maps, both of the period and modern, that have engendered a relatively large amount of comment, though it's generally about one of those better-known battles or scenarios. I remember not being appreciated very much when I pointed out that the decorative maps by Union cartographer Sneden that continually pop up, especially as magazine illustrations, contain many inaccuracies caused largely by the fact that he wasn't even present at many of the battles depicted and relied on second- and third-hand information when he created them.