I also recently finished listening to this book on Lincoln's wartime military leadership during the trip (maybe just after I got back - can't remember for sure).
I enjoyed it - and gained a new appreciation for Phil Sheridan and the Battle of Cedar Creek, which arguably saved the 1864 presidential election for Lincoln and the war for the Union, as well as Lincoln's personal leadership in retaking Norfolk in 1862 when the opportunity presented itself, but I found it to be a little limiting. It did make clear that Lincoln's military leadership sometimes had to take into account the political necessities of his office as well, but all the same it didn't quite get across the towering achievement that his successful prosecution of the war was in the way that, for example, Goodwin's Team of Rivals does. But I did appreciate the extra detail into Lincoln's military strategy. There is a wealth of information here - the more I read the more I see why so many historians are interested in the Civil War.