I don't know if this is the answer you are seeking. You refer to "symbol" which makes me think you are referring to an insignia worn on the uniform or on a flag.
The soldier had a term: "saw the elephant". This term meant that the soldier had experienced the Horror of combat. So when a soldier "saw the elephant", it was saying he was shocked from the sight of something so unusual as it would be to see an elephant.
Slavery began the civil war
he was a leader
Knoxville
Appomattox was the end of the war. Lee surrendered to Grant.
The abolishment of the engineer corps did not relate to officers before the Civil War.
Fort Sumter
The union fought against slavery in the civil war
Total war was General Sherman's strategy. He was to use total war to destroy the resources of the south. I am also a civil war expert so you can trust my answer.
The American Flag could be considered the symbol of the Union.
Julius Caesar's actions started the civil war between him and Pompey.
Musket Mississippi Marching
the civil war was about how slaves should be free, an abolitionlsihins (sorry don't know how to spell that) is a person that wants to "abolish" slavery