This document compares the personalities and backgrounds of Ulysses S. Grant and Robert E. Lee, the commanding generals of the Union and Confederate armies during the American Civil War. It outlines their personality traits, nicknames, families, and military experiences. Grant was described as sensitive but clear-headed under pressure, while Lee was outgoing but had a terrible temper. Both men graduated from West Point and fought in the Mexican-American War before leading opposing sides during the Civil War.