Delphine and Tilly take the train from Carbondale to Cairo in Southern Illinois.
Dr. Hutchings meets them at the station in Cairo and gets them set up in a boarding house run by a widow named Mrs. Hanrahan. There's no place for them to stay but a summer kitchen out back.
Next, Dr. Hutchings takes them to Camp Defiance to see Noah, who is sick with dysentery and yet in the best shape of anybody in his tent. Yikes.
Camp Defiance is not exactly a five-star resort. Two of the walls are earthworks that back up to the Mississippi and Ohio rivers, and most of the camp is mired in mud and filth; soldiers everywhere are sick with measles and dysentery. It's rough stuff.
Dr. Hutchings wants Tilly and Delphine to wait to see if Noah feels up to coming out of his tent (otherwise known as a "regimental hospital") to see them, but they just barge right on in.
Noah, the least sick of the men in his tent, is the "nurse" to the rest of them and the only one not lying in pools of his own filth. Yikes.
He manages to eat a lot of the food they bring, and Tilly notices that he's studying military tactics, still intent on fighting though he can barely stand.