Tried by War: Abraham Lincoln as Commander in Chief

James M. McPherson’s examination confronts a pivotal yet underexplored dimension of the Lincoln presidency: his evolution as a wartime leader. With no formal military training, Lincoln entered office facing a disintegrating union and was forced to invent the modern role of commander-in-chief through sheer intellectual force and necessity. The narrative charts his journey from initial deference to aged General Winfield Scott through the profound frustrations with a parade of hesitant, politically-minded generals, most notably George B. McClellan. Lincoln’s strategic genius lay in his holistic vision, which seamlessly integrated political imperatives with military operations. He championed the concept of 'concentration in time'—coordinated, simultaneous offensives across vast theaters to negate the Confederate advantage of interior lines. His reading of theorists like Clausewitz led him to insist that the primary objective was the destruction of rebel armies, not the capture of capitals. This strategic clarity found its ultimate instruments in Ulysses S. Grant, William T. Sherman, and Philip Sheridan, who executed his vision of total war. The book meticulously details Lincoln’s hands-on management, from his hours in the War Department telegraph office to his detailed communications with field commanders. It analyzes critical decisions, including the blockade of Southern ports, the suspension of habeas corpus, and the timing of the Emancipation Proclamation, each framed as a calculated move to weaken the Confederacy’s material and moral foundations. McPherson ultimately presents Lincoln as America’s most consequential war president, a leader whose pragmatic expansion of executive authority and deep strategic understanding preserved the Union and fundamentally reshaped the nation’s destiny. The work serves as an essential study for understanding the origins of civilian command in total war.