Very good read on the history of the Army of Northern Virginia from the point of view of one who lived it. Surprisingly candid in his criticisms of Lee, though still reverential of the man himself. Of course, Alexander, a veteran of the entire conflict, is best known for his conversation with Lee on that last morning about sending the men off back to their states rather than surrendering to Grant. Alexander still feels a twinge of shame and admits so openly, not because of any ill intentions on his part but because of how small he felt in comparison to Lee's position on the issue.
In terms of tactics and strategy, his main beef is the lack of coordination in attacks, the lack of seasoned staff officers to oversee said attacks, and most interestingly the Confederate strategic mistake of not utilizing "interior lines" between the theaters of the war. He took part in the Battle of Chickamauga, in which the 1st Corps ANV was transferred to the West and delivered a stunning blow to the previously victorious Yankees. Alexander in particular thinks Lee should have personally led troops out West to relieve Vicksburg rather than invading the North in the summer of '63. Certainly an intriguing what if.
Perhaps the most interesting aspect is the flashes of his personal opinion on The Cause. He's clearly accepted the benefits of the Union victory and flat out says the Confederacy would not have survived victory. Hard to imagine any nation fighting a civil war that bloody and then, within days, getting on the same train cars with their former opponents and making a point of being civil. Very interested in reading his other book, but in all of my reading the proposed future of the Confederacy in peace is one I've surprisingly never come across.