... corps commanders, on the morning of the first of September, after receiving the corps of Sumner and Franklin, was as follows: McDowell's corps, ten thousand men; Sigel's corps, about seven thousand; Heintzelman 's corps, about six thousand; Reno's, six thousand; Banks's, five thousand; Sumner's, eleven thousand; Franklin's, eight thousand--in all, sixty-three thousand men. From these forces two brigades, as ...