The Union Army's Youngest General

 

Galusha Pennypacker became a general officer at the age of 20 and was the youngest Union general (and possibly the youngest in U.S. Army history at that rank). He enlisted at 16, rose from private to colonel, and led infantry in the Army of the James. Critically wounded leading a charge at the Second Battle of Fort Fisher in 1865, where he planted regimental colors; he received the Medal of Honor and a brevet promotion to brigadier general. He was too young to vote for Lincoln, the President who promoted him. He stayed in the regular army after the Civil War.

Love, Sex, and Marriage in the Civil War

The Great Northern Rebellion of 1860 (alternate history)