Lots of photos of Civil War soldiers survive.
My two great-grandfathers who were born in the US were too young to fight (one was 9 when the war began, the other one born in 1863), while the other two lived in Europe. I had a great-great-grandfather who was a Confederate but have no photo of him. Another great-great-grandfather was a Union soldier and I have a photo of him but taken many years after the war.
Make your best effort to document the family history. It is easily lost as each generation passes. The advent of DNA family tracing has helped connect some of my family records. My dad reconnected with his half brother. His half brother's mom died in child birth. I now have a connection to cousins that would have disappeared from the family records.