Thanks for sharing this letter written by your great grandfather. I imagine it provided a lot of interesting information that you otherwise never would have known about. For instance the part where he got separated from his regiment when they fell back and that he joined another brigade in their charge- and that is when he was wounded. If it wasn't for the letter, it would naturally be assumed that his wound occurred during his regiment's charge. Have you been able to figure out which brigade he was with when he was wounded? It's also interesting to read how close his wound was to being fatal. Had the worst happened, his company would have had no idea what happened to him and I imagine he would have been listed as "missing" with no further record. It shows how much a letter like this can reveal that would otherwise remain unknown.