For those who don't have a perfect recall of 19th century photographs of figures from a single period of US history, the people depicted are:
President Abraham Lincoln (THE GREAT EMANCIPATOR), Ulysses S. Grant (leader of the Union armies in the mid-late war, and an early champion of equal rights and anti-segregation legislation), William Tecumseh Sherman (scourge of the South and sub's patron saint)
Frederick Douglass (Legendary writer, orator, and antislavery activist), George McClellan (leader of the Union's armies in the Eastern Theatre whose overcaution and paranoia led directly to several defeats, and who was pro-slavery), Harriet Tubman (Antislavery partisan who smuggled slaves out of the South into free lands, and a Union spy/scout)
Robert Gould Shaw (white officer who led the first Black unit of the Civil War, martyred heroically beside his men during an ordered assault against Confederate fortifications), George Meade (leader of the Union armies after McClellan, helping salvage the Eastern theatre and averting total disaster), George Henry Thomas (general whose stout defense in Chickamauga helped avert disaster for the armies of the Union)