In which battle did the most Americans die? The question is answered in the following lecture:

[Camaromjr]

6. They Are All Americans

The deaths in the Civil War are all counted as American deaths. As a matter of fact, the Union was preserved, so they all were Americans (Play Dixie for them so that they can understand they can still play it under our rule. -- Lincoln 4/10/65 while leaving Richmond).

The mass graves at Shiloh were more of a consequence of the high temperatures. There was a request for a truce, but Grant had already ordered the burials. The graves are marked with cannon balls as a surround and interpretation to offer a bit more understanding. A couple of them are a bit off of the beaten path. FWIW, Shiloh is one of the more pristine battlefields. Due to its remoteness, it is not heavily visited and remains much as it was in April, 1862.