For over the nation’s first century, defense of America for various wars, stayed in the hands of state militias – War of 1812, Mexican War, Civil War, Spanish American War, World War 1 and even to a significant role in World War 2. The US Congress always remained desirous to maintain a small regular army during peacetime which could change in times of war with massive influx of militia brought in from the states. This led to a series of problems in each war America involved itself in. One of the major problems became that of leadership.  Captains went from commanding company-sized groups – 100-250 men – to commanding generals leading armies of several thousands. On the job learning in warfare costs lives. Here, we will focus mainly on Civil War generals.