This kind of touches what my thesis will focus on though I will deal with wounds and disease from a broad sense. Gettysburg is not the bloodiest battle of the war in terms of percentages. The first battle of Manassas or Bull Run takes the medal in that category. In the year of Gettysburg (1863), field and hospital medicine is gradually stretching its hand out. The first battle of Bull Run occurred in 1861 and both sides were highly unprepared because of the high number of men who participated in the battle. Huge numbers of wounded were left on the field to essentially rot because of the inability to cope with the large numbers. (Wounded were around 1,000 or more for each side) After Manassas, ambulances were formed aiding in the ability to transport the wounded to field hospitals, to ships to be sent to permanent hospitals, or to individual homes. The majority of the traumatic impact, as far as from a medical view, of the battle would be put on this local community in terms of the care of these soldiers. You can read in several diaries of nurses like Kate Cummings or southern belles like Nanny Haskins how it affected them. They would hear the screams of the men. Nanny even says she feels for them even though she knew they were not Confederate. The care was not left to just nurses. Confederate forces used individual homes to house wounded soldiers so the screams were heard in the field, hospital, and home. There was no sense of PTSD in this time so the impact is hard to find. I do believe the wealth of this information is found in the diaries of nurses and sometimes local confederate girls who would have chance to witness the true suffering of the wounded. I hope this answers some of your question at least from the medical standpoint