Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not credible

As many other reviewers have pointed out, the "Celtic" premise is ridiculously overblown. The Army of Northern Virginia can not be compared to the Scots at Culloden in 1745.Also, as other reviewers have pointed out, the book ignores many "big picture" issues that played into the outcome of the war. Better alternative reading would be "Two Great Rebel Armies" by McMurry or "Why the South Lost" by Hattaway and company.