I was the President and commander in chief of the Union Army. Who am I?

I was the President of the Confederacy. Who am I?

My nickname was "The Old Man," and I led the Confederate Army. Who am I?

I helped gather medical supplies for the wounded soldiers and was nicknamed, "Angel of the Battlefield." Who am I?

I am a song that gave a secret message to the enslaved Africans about the Underground Railroad.

What was the important announcement from President Lincoln that allowed slaves to fight in the war?

I commanded the Union Army and demanded "unconditional surrender" from the Confederates. Who am I?