The final year of the American Civil War comes down to two generals: Ulysses S. Grant, newly given command of all Union armies, and Robert E. Lee, defending Richmond with a Confederate force he can no longer replace. The film tracks their campaign through the Wilderness, Spotsylvania, and Cold Harbor, battles where Grant absorbs staggering losses but keeps pressing south rather than retreating as his predecessors had. Historians and battlefield footage lay out the arithmetic behind the strategy, more than 600,000 American deaths across the war, and why Grant's willingness to trade casualties for ground eventually breaks Lee's army at Petersburg. Maps and location photography trace the nine-month siege that pins Lee down until his supply lines collapse, ending at Appomattox Court House. Rather than treating Lee as the tactical genius of Civil War myth, the film weighs how Grant's grinding, resource-driven approach out-lasted Confederate maneuver, reframing the war's end as a contest of attrition as much as generalship.