From Wikipedia’s “Battle of Shiloh“:
The evening of April 6 was a dispiriting end to the first day of one of the bloodiest battles in U.S. history. In the Civil War, medics were not sent into the field to collect and treat wounded soldiers. Hence, many soldiers were abandoned to bleed to death, or in the case of Shiloh, be eaten alive by scavenging animals as a thunderstorm went through the area. The desperate screams of soldiers could be heard in the Union and Confederate camps throughout the night. As the exhausted Confederate soldiers bedded down in the abandoned Union camps, Sherman encountered Grant under a tree, sheltering himself from the pouring rain, smoking one of his cigars, considering his losses and planning for the next day. Sherman remarked, “Well, Grant, we’ve had the devil’s own day, haven’t we?” Grant looked up. “Yes,” he replied, followed by a puff. “Yes. Lick ’em tomorrow, though.”