General Sibley was in charge of the Confederate Army that invaded New Mexico in 1862. This book is very informative and is very good reading from the same author of Sibley's biography. General Sibley drank a bit! On the field he actually won the battle, but being pre-occupied he stretched his forces too thin and got his supplies severed. He eventually lost the campaign. If he had been sober he had a good chance of real victory. The battle, which took place between Confederate and Union forces at Glorietta Pass, has the distinction of the Civil War battle fought at the highest altitude. This bit of Civil War history never makes it into the books. In "The Good, the Bad and the Ugly" directed by Sergio Leone and featuring Clint Eastwood this is the Civil War campaign that the film is based around. General Sibley's name is mentioned in the film.