Read about the Carnton Plantation, https://en.m.wikipedia.org/wiki/Carnton

It was a temporary field hospital for the Battle of Franklin in Tennessee. It doesn't talk about it in the wiki page but if you search for "Carnton house blood stains" or go on a tour yourself you can see how horrific it was. Quite literally you can see the blood stained floorboards today from the civil war. You can still walk on them.

There is a place on the second floor where one of the surgeons had a bucket on the floor to hold his tools and the entire floor around it is stained with blood except for a small ring from the bucket which is unstained.

Highly recommend a tour of the house, grounds, and small museum especially if you like history. Plus let me know if you are in town. ;)