Here's an excerpt...
When the firing commenced the hospitals began to empty. All who were able to pull one foot after another, or could bribe or beg comrades to carry them, left in haste. In vain we implored them to stay; in vain we showed them the folly, the suicide, of the attempt; in vain we argued, cajoled, threatened, ridiculed; pointed out that we were remaining and that there was less danger here than on the road. There is no sense or reason in a panic. The cannon were bellowing upon Douglas's Hill, the shells whistling and shrieking, the air full of shouts and cries; we had to scream to make ourselves heard. The men replied that the "Yankees" were crossing; that the town was to be burned; that we could not be made prisoners, but they could; that, anyhow, they were going as far as they could walk, or be carried. And go they did.