General George Armstrong Custer was a prominent officer in the Union Army during the American Civil War. He gained fame for his aggressive tactics and leadership, particularly during the Battle of Gettysburg and the Battle of Appomattox. Custer quickly rose through the ranks, becoming a brigadier general by the age of 23. After the Civil War, Custer served in the Indian Wars, where he led campaigns against various Native American tribes. His most notable engagement was the Battle of the Little Bighorn in 1876, where he and his troops were defeated. This battle marked a significant moment in U.S. military history.