The chapter delves into the repercussions of attrition on the Union and Confederate Armies during the Civil War, highlighting the emergence of new and capable leaders like Meade, Reynolds, Hancock, and Chamberlain due to resignations, promotions, and casualties. It explores the changes in leadership within the Army of Northern Virginia after Stonewall Jackson's death, Robert E. Lee's strategic decisions, and the challenges of succession and trust faced by the Confederates. The chapter also emphasizes the importance of leaders nurturing more leaders for effective command and discusses strategic decisions like Battle of Chancellorsville, Vicksburg, and Lee's tactical shift with three core units.