We left Charles Sumner with John Slidell, who pulled back from him when they both came to a doorway. Slidell explained his apparent indifference as actual indifference a while after. Sumner had more immediate concerns. He lay on a sofa in the Senate anteroom, where Dr. Cornelius Boyle found him
bleeding very copiously, and with a great deal of blood upon his clothes. The blood went all over my shirt in dressing his wounds. His friends thought I ought not to dress his wounds there, but take him to his residence. I differed, and stated my reason, that if I dressed his wounds at once and at that place, they would heal by first intentions; and that if I did not, suppuration might take place.
Nineteenth century doctors believed many things we no longer do about the body, but concern for infection remains current. Best practices for sanitation, unfortunately for their patients, have come a long ways since. You could tell an accomplished surgeon of the era by his apron, turned black and stiff with dried blood. That doesn’t make them malevolent, though many doctors did resist adopting more modern methods that we know produce better outcomes. They did their best by the knowledge they had.
Boyle took stock of Sumner’s condition, discovering
There were marks of three wounds on the scalp, but only two that I dressed. One was a very slight wound, that required no special attention. One was two and a quarter inches long, cut to the bone-cut under, as it were, and very ragged. […] The other is not quite two inches long
I can’t imagine Sumner’s head must have felt. We know how profusely they bled, but it sounds like a flap of his scalp was just torn up. The committee pressed for the literally gory details and Boyle confirmed that both wounds “cut to the bone”.
I have the probe now in my pocket, from which the blood has not been washed [Instrument produced.] One was a cut to the depth of nearly an inch. It is only an eighth of an inch to the scale, but it was a cut in and down.
The two cuts fell on the left side of the back of the head, apparently dealt when Sumner was still bent down or as he tried to flee, and “in front, about two inches from the median line.” Additionally, Sumner suffered bruising and less serious cuts. Boyle remarked that
There was one slight mark on the back of his head, but not severe enough to require dressing […] There were marks on the hands also, and a red mark down the face near the temple
It sounds like Sumner managed to block or deflect at least a few of Brooks’ thirty licks. It might well have saved his life. Boyle testified that a strike to the temple could have gone right through into the brain, or cut the artery there. Either could have killed. Brooks instead hit the thickest part of the skull. That in mind, Boyle said that “Such blows would not ordinarily produce death.”